I have noticed inconsistency when exporting Jails via Warden utility. Error occurs on my PCBSD 9.2-RELEASE-p8 x64. Warden has 3 jails and when one jail is selected, export button works on another (not selected) jail:
Same behavior is occurring on stopped or running jails, except that when Jail is running - different jail is exported:
I tried exporting last jail also (named ten), but this one exported as it should.