I purchased new plugins and accidentally scanned the entire "C drive" into AcidPro. It will begin to scan without the progress bar moving, then get to 100%, but will not open. Any ideas? Thanks for your help.
you could edit your plugin paths manually in your user folder, located at C:\Users\<UserName>\AppData\Local\MAGIX\ACID Pro\10.0. There you will find a file named acidpro_bridgeaware_plugincache_x64.xml, where you could delete the following line
<VSTSearchPath ...>C:\</VSTSearchPath>
if you are familiar with the xml format or you could just delete this file, but then you fall back to the default VST-Paths. Let me know if this solves your problem.