BUG Converting to AAC

I am having a problem when i convert a .wav file to acc itunes standard from the encoded presets. Half way through encoding a 3hr file the render box just disappears and no file is saved? Only way i seem to get it to work is to restart a windows 7 machine using the latest version of WL9P .35

Does the same thing happen if you render to one of the high quality MP3 presets?

No it doesnt, Only AAC i think. The only way i can get it to fully render the file is by restarting my machine. Weird one but thought id report it just incase.

Exporting instead of using save as, seems to work

mono or stereo file?