Open Source Document Management System | OpenKM

I am Using 5.0 Openkm , I am having an issue with documents being locked after they have been checked out, but I am not able to unlock them even using okmadmin user. I somewhere in the forum found that the error has been fixed in 5.1, can you please tell me which part of the code i should look for the fix. I cant ugrade to 5.1 immediately because I did some customizations to 5.0 ..so please can you point out which files I should look for the fix.

Are you using the last 5.0.X because must be solved there too. Which version are you using. Now you can not upgrade to 5.1.x because is not yet considered as stable and we've not implemented the migration procedure.

About customization you've done, what have you done ? widget extensions or other kind ? if you've done it correctly must not have problems when upgrading.