Yeah, actually crashed for the first time ever today (although take into account that I mostly play STO or CO and only dabble in this game once in a while). Same kind of errors in the crash.txt.
Necro or not, I too am having this same issue. It doesn't make sense that returned items should be doing this, Cryptic's other games don't do it. It makes selling items an even bigger hassle than it should be!
I figure I owe an update on how things turned out with the screenshot issue. First, going into Inspect Mode and trying it without success proved that the bind was indeed broken. So I tried Shrike's suggestion. Frankly put, /bind SysRq "screenshot_jpg" didn't work. In fact, it wound up binding the S key to take screenshots…
That's most definitely not the issue. I don't use Steam. The last time I tried that on an MMO (so I could get a view of the UI for a tech support reason), I wound up with a solid black image in Paint.