I can't get 2.6.5 to work in a follower dungeon.

Because I've got some extra code that runs when you are in a group that doesn't need to run in a follower dungeon (and could cause issues like that message you got). And I've made some features not work when you are in a group (like showing both total and session data at the same time). So I'd rather treat follower dungeons as if you are not in a group, because in most cases you are actually solo.

Should the IsInGroup() calls in SetChatType be changed to GT:IsInGroup()?

No, that is fine. I only need GT:IsInGroup() in certain parts of the code.

Can you explain a bit more? Does it not show anything? What options do you have selected?

I got it to work by commenting out the if C_LFGInfo.IsInLFGFollowerDungeon() == true then. I checked /dump IsInGroup() and it returns true for follower dungeons. Group Mode is set to Group and Solo.

Can you post a screenshot of the General and Look and Feel tabs. Everything is working just fine for me in follower dungeons.

I get a lot of "You aren't in a party" in chat when I loot. Not sure if GT is causing these.

Just verified that it is GT by disabling it for a couple of pulls.

I'm not getting any "You aren't in a party" messages on my end, but that line you commented out would likely cause that to happen.

I'm pretty sure I found the issue why it wasn't displaying anything for you, it was a logic issue related to how I initialize an item and store its data. This is fixed in v2.6.6.

Just finished the follower dungeon. I'll download 2.6.6 and check it again.

Why do you want to return false when in follower dungeons?

Gonna close this now, feel free to repost if its still not working.