I've never used any mods, I have all expansions, using game on steam. 1) Selecting to have random skills, the first skill is sometimes missing its graphic, although mousing over it shows the name (I'm running 1280x720 windowed) 2) I killed a bunch of 4 octo then moved off into another room, then came back and one of the octo was showing a live graphic instead of dead although it wasn't animated and showed as dead on mouseover. 3) On one of the earlyish levels where there aren't bricks on walls, there was one section of wall, one square wide where there were bricks for the top half of the wall. (I know this is probably too vague to be helpful so sorry for this one). 4) I levelled up one time when I had 9941 of 11500 xp. I have a screenshot of this I can upload if you need, although all it shows is me picking a skill with the xp bar visible. 5) Mastered communism tree and got no achievement (though I see this is known about). 6) Not sure if this is a bug or feature, but xp not counting towards next level: I was one xp to next level, smashed a statue and levelled up but was then 0/xxx on next level.
1: If it's what I think it is, fixed as of the latest hotfix 2: Not entirely sure about this, but it's known. 4: I believe the bar counts the total needed to the next level as soon as you reach level up point, so you were seeing the total needed for the next one. 6: Known, it's complicated but they'll fix it at some point.