I have the same issue....
I loaded .67 on a couple days ago with no issues. However, now when I go into Desktop Manager it wants to erase this Blackberry API Library on mine too.
I uninstalled the .67 OS and reinstalled on the PC just to make sure in my tinkering I didn't remove anything I shouldn't have. I've added no third party apps since the .67 upgrade. I'm guessing the DM knows what it's doing but I'd like to know what it's doing, too!!
Anyone?