Hey guys I have a piece of code that runs in a background thread, and it crashes randomly. I can't see any structure to the crashing, other than it always seem to crash at the following line: jpeg_data = rep.representationUsingType NSJPEGFileType, properties:options Are there any known issues with this and macruby, or am I wrong somewhere else? I tried running it both on the main thread and also by using sync instead of async when i dispatch the thread to the queue, but it still crashes randomly. I'm not entierly sure how to debug this, all I get in the log is an EXC_BAD_ACCESS and then it stops in my editor at objc_msgSend. Any ideas? :) PS. I need to rescale an image, if anyone know any other way that works in a background thread please share. :) Thanks! Kenny