Alright, this is using Pokegamer1989's test quest: http://www.freewebs.com/masterpikachu/ZC%20Content/Incomplete%20Quests/LOZ-Generation4.qst
I was on my way to throwing in some magic prisms and crap to test the crashing bug he had posted, and I decided to scroll around the screens a bit to pick one to add the combos on, and ZQ seems to almost randomly crash when switching between certain screens. Most of the crashes happen on the highest 3 or 4 maps in the quest, and crashes sometimes as soon as I change to a screen with anything on it.
I also had it crash once while going into the Init Data. As soon as I clicked the menu option, I got a memory could not be read error and ZQ immediately shut down, even after trying to restore it with the debugger like I do with the combo table crash.
Not sure what's causing them yet, but that test quest seems to be quite crash happy in ZQ. It doesn't do it every single time on the same screens, but it does happen quite frequently sometimes on those last few maps.
Just another note, this is in fullscreen, in small mode, which is starting to show some of the same symptoms as large mode apparently.