Question

I did not have any problem exporting mp3 from my project.

 and today I was trying to export one of my project in mp3 format and there was not option was exporting mp3.

 wave, flac etc... those options are still there and just mp3 wasn't there anymore.

 I tried to re-open the project and open other projects as well and it's all the same.

 What is the problem here? it just disappeared.

Answer 1

Go to help about to make sure you are running Studio One Professional and not another version.  (Many users have multiple versions in their user accounts).   If not, switch it back to Studio One Professional via Studio One > Studio One Activation.

If it is Studio One Professional and your mp3 capability is gone, consider installing it again to see if it comes back.