Sounds like you may have inadvertently enabled some of the filter options. Their is a large filter Tab in the top right. I hope this helps, if not hope you work it out soon.
I am also very grateful to those doing Primus and other Les Claypool related CDLC. ( If they read this : Maybe do some Oysterhead?? ) The song you mentioned seems to be working. I was able to download and install it fine..I should say download and reinstall, i had it already but checked for you anyway.. I do not have time to do a play through of it at the moment, but i expect it should work fine.