Working in Blind we tried to Undo the last three commands in the command line. One had been done by me on User 1 and 2 had been done on a Client set to User 2. My command was to make a channel absolute, dumping Preset references. The two commands after were User 2 patching addresses to channels.
When we hit Enter and lost all info back to our last Save, about 45 minutes worth of programming. My Design Associate called support and was told this was a known error having to do with Flexi Channel. Similar to the Curve Flexi problem that has been mentioned in the Forum.
Good Luck!