Yes, we found the fix. You can either install the updated 2012.4.152 (or later version) or manually register the slmixerpro.ocx file by running the command on the Windows Start menu. If you don't see a Run command, try pasting it into the Start menu where it says "Search Programs and Files" and then pressing enter.
regsvr32 "c:\Windows\SysWOW64\SLMixerPro.ocx"
Where the path of the slmixerpro.ocx file may vary depending on where it is on your system. Again though if you run the v2012.4.152 release package from the main download page that ought to fix the issue without having to do the manual registration.