Some confusion here which may cause a reset. I am actually on WaveLab7 LE. I thought I had 8 when I posted this but PG you are commenting on 9. Perhaps they are all the same.
I have an .mp3 file. I open it, edit it and try to do a “Save As” and specify .mp3 and nothing happens. I have the save beging directed (via the dialog box) at the folder I am using and the folder does not reflect anything new was added to it. I changed the name of the new file so to preserve the original. Nothing is there. I have done a extensive file search on my HDD to see if it may have saved somewhere else. Still nothing.
I can save it in different formats but not .mp3.