I noticed that BB now threads joining the parts together (it didn't used to, IIRC) quite nicely. It would be nice if the Join Files command on the file menu was also non-blocking, and perhaps could have a progress window to show where it's at. Right now I usually have to just refresh the file listing watching the size of the joined file to get an idea where it's at. Once BB starts responding again then I know the files are joined together.