When I try to render and mp3 file from acid pro 11, ot won't do it and a hint pops up saying the acitivation code you entered is invalid. This only happens for MP3 files. I never had the issue until I upgraded to Acid Pro 11. I have a valid license that I paid for.
@SCOTT-MARTELLO Try resetting the program settings by holding CTRL and SHIFT and double clicking on the program icon. A small window should appear asking you to reset the program settings and clean the cache. You will lose all your settings, but I don't think any other method will help.
@SCOTT-MARTELLO Maybe a reinstallation could help. Disable your Windows Defender firewall and antivirus during the installation. Maybe they blocked something. Enable them again after everything was installed.