Stack attack has always been bugged, I don't really like that option and many times I was tempted to remove it altogether. I didn't write that part of the code, I really don't know how to fix it, sorry.
About resource labels, never experienced but then again I seldom use that feature.
Lastly, AI behaviour depeds on settings. If you play on Deity on a small map for example, AI doesn't stand a chance. Mod is not designed for certain settings: I would totally remove any map smaller than large, except for testing purposes. I'm not doing it because I know people are using small maps too. Which settings are you using? (mapscript, mapsize, gamespeed, revolution on/off, flexible difficulty/flexible AI are the most important I can think of).