Browser Presets Wonky....?

Hello,
 
In Sonar Platinum, there are many presets in the browser that point to missing locations, and I cannot seem to delete these or change them.
 
I installed all the Cakewalk content on the C drive and subsequently moved it to another drive, and updated all the file paths in the preferences menu. However, the browser module still has a lot of missing locations in the presets drop-down that I cannot seem to change or delete (e.g., MIDI Groove Clips or MDGrvClp). Any hints? Perhaps it's a bug insofar as the hard-coded preset didn't get updated under the hood when I changed all the paths in the preferences whereas other hard-coded values do point to the new folders.
 
thanks!