Clipster/Fuse reports Decryption key check failed after application startup.
This could also occurs when upgrading into Version 5 from lower versions.
In the Clipster program.
Down the bottom left of the screen, click on Config... > Defaults > DCI
Update the path under Self KDM Certificate, click on the ... to the right.
The Cert File is located in c:\Program Files(x86)\DVS\Clipster\Certificate Store
Click on the appropriate cert file and ok.
Close and re-launch the Clipster program.
That will clear the error. (Also, this would only affect you if you are doing encrypted DCPs.)