Die you you reboot the PC after installing the update patch and was the PC connected to the internet when initially opening a MP3? Were there any error messages or screeching sounds?
Otherwise, download the Sound Forge Audio Studio14 application installer from the Magix Download Center, or the Magix Service Center> My Products, and do a repair installation (install over what is there). You should not lose any customizations and such. The other installer items and plug-ins do not need to be reinstalled.
btw, welcome to the Magix Sound Forge users forum @DJDavidBertelli.
Is there a "mp3plug2.dll" file in the Program Files> Sound Forge> FileIO Plug-Ins> mp3plug2
You can try resetting SF to the factory default settings and clear the cache in the "File" menu. If that does not work, uninstall with a third-party uninstaller (like Revo Uninstall) that can clean leftover registry entries and other pertinent data the default uninstall leaves behind, then reinstall.
Please try this: Open SF, go to File > Reset all preferences and cached data. After that, close the program and restart it, and all should be good to go! ;) We're very sorry for the inconviences.