When I try to export the audio and save as mp3, the progress bar stops about 3/4 of the way through. I am using Windows 7. Until today, I have had no problem. I hope someone can help.
Perhaps you have no disk space left in the location you are trying to export to?
You forgot to give your Audacity version - see the pink panel at the top of the page. The current Audacity version is 2.1.0 - http://audacityteam.org/download/windows.
Gale
My version is 2.0.6
Assuming it was a typo, I deleted your previous post where you said you had 2.0.1.
The answer is the same though - please check your disk space or wait for the progress bar to complete.
Gale
I have several tb of disk space free. I just downloaded the latest Audacity version, but still no luck.
Do you have terabytes of space on the drive you are exporting too, or has a per-user space quota been implemented on the drive by an administrator?
An MP3 starts being written as soon as the MP3 export progress bars appear. From your description, you already have three-quarters of the MP3 when the progress bars lock up. So as a quick fix, you could click at the end of the track then Generate > Silence of about half the length of the audio you are trying to export.
After that, I suggest you install or reinstall the current LAME MP3 encoder available from http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#lame .
Gale