I found that error as well. It took me forever to figure out why my sprite animations totally freaked out. Not sure what causes it, but sometimes the config adds a bunch of 3's in the frame animation array. Also, if you click the delete button in the frame delay window, and you don't have a frame selected, you get an unhadeled exception.
Also, when you rename an event to make it an enemy, oftentimes it won't move for awhile. You can hurt it, but otherwise it acts like a lifeless object. Usually fr about 5-6 seconds. (though this probably could be fixed by giving said renamed events a battle flow command)
Another one, that's been around since an early version is this. When you have an event that sets the player move route, it adds to itself whenever you trigger the event. For example. You have an event that makes the player move left twice when you touch it. First time, all is well and good. But, trigger it again, and something strange happens. It will move you FOUR spaces to the left. Touch it again, eight. And so on until you're stuck at the edge of the map. Not sure what causes this error, but it's been around for a long time.
Sorry if this is a disorganized confusing post, but I don't have much time to be on. Sorry.
@blizz, yah, n00bs never read the manual. Just look at all the "How do you make the player teleport with an event" threads on CA, XD Don't let them get to you. Either ignore them, or just say "read the manual, it's explained in there" and if you're feeling nice, give them the section its in. Because that manual is getting really hard to find things in. It took me 20 minutes to find the section that explained events appearing on the map.