I haven't had any crashes with LAA, it's working fine for me. I can't really help specifically with what your describing. Is it crashing when you pick a specific tileset? Crashing during world gen? Getting the game to even load? Mid gameplay random crashing etc? Could you give a vague run do exactly what your doing? from loading the launcher, to any specific changes, from default (Have you tried running it from default?) Have you tried running the game at a 1x1 embark with pocket sized world just to see if its a world gen issue? - Do you know you can only make world from "Design new world from advanced parameters" Using the default vanilla way will cause issues. One thing does strike me when you mention the strange pastel colour is that in the last version he added seasonal whole UI colour pallet change(The UI changes colour when a new season hits) but I thought that was specific to the meph tileset, it could be an oversight when running any other tileset than that, which would explain why i haven't had any issues but I'm sort of guessing here.
I typically run a 10x10 embark on a medium region world with 120 civs at 50 years, Hostiles and Interactions are doubled from default, I use soundsense, therapist, LAA, Under graphics on the INT part of the menu - I use Colour / Pheobus - Print mode / TWBT - Font / Masterwork - Tileset / Meph 32x32 - Win 7 64bit, 16gb ram 770gtx desktop.
Also Vanilia 43.05 is using 64bit instead of 32bit which is what the current masterwork version is using due to DF hack at the time wasn't ready to release 64bit hack to the general public which might point it towards a memory issue, but I have had no random crashing due to out of memory on the above mentioned settings :S so I'm at a bit of a loss as to why your crashing. Anyways I hope some of this helps.