Hi Sofix,
Yes, i have came across such .CTK issues earlier and could not able to power On vm's,
However if you know .ctk files are Change track files which keep tracks of the snaps shot, i mean those are the files which will take snapshots back to its parent disks.
if they automatically get deleted when when consolidations happens ( and they ought to delete), However in this case those are remained due to lock releasing issue.
1. Login to esxi by root.
2. browse the vm files and check how many .ctk are there
3. make one directory, by name ctkfolder, eg on same location were you are #mk dir ctkfolder
and then 4. mv xxxx.ctk ( move all .ctk files to folder you created).
and make user there are no ctk files and then power On/Tried to consolidate it.
VM has to consolidate and if happens Ok or can you let me know if there is .lck files also along with .ctk files.
Note: I know .CTK file are creates this kind of issue if they remain undeleted after consolidation.
Regards
Basavaraj.R Navalgund