Rowan Chaplin

I purchased some clothing with some prim attachments, and, as happens sometimes when you get these things, you need to edit their positioning to fit your personal shape. Ok. I right click, hit edit attachment, like always. Except, after the edit menu is opened, as soon as I touch the positioning arrows to try and move the attachment, I immediately crash. And it's doing it with everything. Avatar attachments. HUD attachments. Stuff I've edited before without problem. Every time, crash. Anyone else had this? And if so, suggestions, please?