The problem is related to backup function. We have found a workaround: in Preferences/Files/Backup/Backup Files should set to disabled or save in absolute path and set it to local drive.
When no backup is saved on network drive, everything works fine.
PL/SQL developer version 11.0.3.1770
I'm working in PL/SQL developer from Citrix virtual desktop.
When I open any file from any network drive in our corporate network, the Developer allows to save changes in file only once. When I try to save it later I see error
But I've checked, that file...