When exporting a session ardour (3.5) crashed and everything (Ubuntu Studio 14.04) froze.
I had to open an "emergency terminal" (ctrl-alt-f#) to kill and reboot, and didn't manage to copy the error message. Still I believe I can find it in some logs, but where to find the log?
Oh, and when Ardour loaded the session after reboot it was with this
[ERROR]: could not reconstitute MementoCommand from XMLNode. object
type = ARDOUR::AutomationList id = 21170
I suspect the reason for the crash was that I tried to give the export file a new name not already on disk.
This should probably be in the Ardour forums, I know. I intend to register there at some later time...