• Please copy/paste the error message you see on your screen, if any.

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• Please explains what you wanted to do, what you do and what happened

• What is your browser?

• Please copy/paste the text displayed in English instead of your language. If you have a screenshot of this bug (good practice), you can use a picture hosting service of your choice (snipboard.io for example) to upload it and copy/paste the link here. Is this text available in the translation system? If yes, has it been translated for more than 24 hours?

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?

• Please explain your suggestion precisely and concisely so that it's as easy as possible to understand what you mean.

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?

• What was displayed on the screen when you were blocked (Blank screen? Part of the game interface? Error message?)

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?

• Which part of the rules was not respected by the BGA adaptation

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• Is the rules violation visible on game replay? If yes, at which move number?

• What is your browser?

• Which was the game action you wanted to do?

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What do you try to do to trigger this game action?

• What happened when you try to do this (error message, game status bar message, ...)?

• What is your browser?

• At which step of the game did the problem occurs (what was the current game instruction)?

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What happened when you try to do a game action (error message, game status bar message, ...)?

• What is your browser?

• Please describe the display issue. If you have a screenshot of this bug (good practice), you can use a picture hosting service of your choice (snipboard.io for example) to upload it and copy/paste the link here.

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?

• Please copy/paste the text displayed in English instead of your language. If you have a screenshot of this bug (good practice), you can use a picture hosting service of your choice (snipboard.io for example) to upload it and copy/paste the link here. Is this text available in the translation system? If yes, has it been translated for more than 24 hours?

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?

• Please explain your suggestion precisely and concisely so that it's as easy as possible to understand what you mean.

The problem is that arena mode for 7WD is always without expansions because the Gurus witch are voting for it are the one playing without the expansion. And the way it is can never changer because expansion players can only become Guru by playing without expansion witch they obviously won't do.
That's a problem.
A LOT of player would love to play arena mode with both expansions (and top players in all time ranking are mostly playing with Agora et Pantheon), so there is two solutions :
-Alternate arena season from vanilla to both expansions.
-Create a second arena for 7WD with both expansion.

• What is your browser?