WowAce

When UI is reloaded inside a BG, PLAYER_ENTERING_WORLD event is triggered but GetInstanceInfo() returns 0 for maxPlayers,  as 0 is not a valid raid size the addon (to avoid displaying zero unit frames) uses the raid size: 40.

To fix this, as workaround,  UPDATE_INSTANCE_INFO is registered, this event is fired after PLAYER_ENTERING_WORLD,  when GetInstanceInfo() already returns correct values (it seems, at least in my computer and inet conexion).
Warning this maybe is not reliable because UPDATE_INSTANCE_INFO is fired because Interface/FrameXML/RaidFrame.lua calls RequestRaidInfo().

Fixed in revision 870.

It seems revision 870 did not fix the problem for all players, trying to fix the issue in revision 873.

Feedback about v873 behaviour will be welcome.

I tested it out today in a random BG.

My theme is set up to use a different layout for 40 man raids and another layout for the other raid sizes.

I entered a seething shore BG and on entering the BG the 40 man layout was enabled automatically.

The seething shore is a 10 man BG so the switch did not work unfortunately.

My default theme was set to an arena layout before.

Tested in seething shore (and another bgs) and here is working correctly:

Is there any bg/arena where the raid size is detected correctly ?

Can you test the issue with all addons disabled except Grid2 ?

Could you PM me your profile (exporting the profile to text format from Profiles->Advanced) ?, to investigate if it is due to some setup problem in the Grid2 configuration.

Finally Stamic issue is a different problem, opening a new ticket #652 to track the new issue. The original issue in this ticket must be already fixed.