Here’s something rather interesting. I was about to increase size of thin provisioned disk on one of my VM’s and was greeted with my usual option (as expected) being greyed out (not so expected!) I certainly haven’t seen that before. Picture for illustration purposes showing what I’m on about:
I’m thinking since there is -000001.vmdk file present I must be running off a snapshot that prevents me from resizing the disk (which would make sense..) Another picture showing Snapshot Manager window: