Next there was an issue with guards in the Talos temple during the Markath quest that would send me into the mines. They also did not force the conversation, but I had to press 'E' again.
Then there was the issue with several quests (Karliah standing at the stone, but not proceeding to allow entry. A followup quest that would not trigger the reward and just made characters stand there being 'busy'). Quite a few times I was forced to update the quest entries manually through the console.
But what made me search the internet and finally making this post was me being unable to get any options going during the Season Unending quest at the table.
I'm using v1.5.26.0.5 and at first I figured that maybe it was the third-party addon ScriptDragon, as I installed it (next to ThuuMicShouter) around the time I started noticing some odd behaviour (ThuuMic didn't work either sadly, because my language pack was not supported in Windows). But removing it (just to check) did not change the course of the Season Unending quest (still no options when I was asked if someone should stay or leave). Disabling recently added mods had no effect either. Verifying the integrity of the game files through Steam also did nothing apparently.
So at present time I am at a loss on what might be causing these problems as it seems to relate to some kind of 'proximity-trigger' that should trigger an automatic event but is bugging out and not triggering anymore.

I'll include my (very small) list of mods in use here; although I don't believe any of them are to blame:
Arrowsmith
HighResTexturePack01
HighResTexturePack02
ApachiiHair
MikeHancho's Breezehome Tweaks
WATER
HighResTexturePackFix
UniqueLevelledItemsUpgrade
ScenicCarriages
ArmoredCircletsQuickFox
Cat_Mount


