C1 Crashing when trying to delete smart albums & folders

Hello everyone,

I am trying to delete a couple of smart albums and folders from my catalog. Some can be deleted, others cannot. The program freezes. And after restarting the same thing happens. Basically I now am stuck with a couple of folders and smart albums....

Could my catalog be somehow corrupted in a way 'verify catalog' doesn't catch? Should I rebuild my catalog? Or is there a way to solve this problem?