After recovering from a Computer crash, I have got everything working again. 

However, and it's a big however, RC4 is having repeated sound problems, in that it doesn't respond to commands.

I have found out, by trial and error, that the cause is most likely the OCX files that have to be registered. In particular the Richtx32.ocx file.

If I register it before starting P3D/RC4 everything works, but next time RC4 will not work.

It seems that the file is un-registering itself, if that is possible.

This is way beyond my knowledge. Does anybody with programming experience know how to make the file work every time without have to register it?

The command I am using is: regsvr32 c:\windows\system32\richtx32.ocx (Have also tried syswow64). with elevated privilege of course.

Ian, do you have an antivirus program? If so have you set it to ignore those two folders?

Searching the RC forum for that ocx doesn’t show much. In John’s pinned topic that file isn’t mentioned. One thing you could try is to unregister it and assuming that’s successful try registering it again. Action in both folders of course.

Ray,

Set the AV to ignore those folders and so far today everything is still working. Never needed that before but maybe the AV has been ramped up in its capabilities with a recent update. Thanks for the suggestion.