Comment 1 for bug 559540

in combination with Bug #599643 this is some sort of usability nightmare as the UI freeze for a long time just to post a cryptical error and the average user might think this app i very crappy, what it isn't is.

wouldn't an easy temporay solution be that the save button just opens a simple window (no progressbar, but an short text explanation) that then starts the conversion process and freezes the UI?