All my buffers were shown as deleted by SE

[rjpontefract]

I was using SE 27.0.2 on Windows 10 with multiple buffers open.  I came to save the file I was working on and a dialog said that it can't save it.  Following that, another dialog box asking to close or save deleted files was presented with a list of all open buffers.  The list of buffers showed all files in red.  Trying to quit SE resulted in being told it could not save preferences. All of the files were on a local disk and were still present and correct according to file manager.  I killed SE from task manager and it restarted OK. 

Any ideas as to what happened?

[Dan]

Were they on a remote file system and/or a VPN?

[Clark]

I haven't seen anything like this. The only time I've had problems saving files is when my backup directory is set to a directory which can't be written to.

[Dan]

If anything like this ever actually happened, you could go to File > Backup History Browser.  This would show you all of the files that are available in Backup History.

If you have more than one configuration, you would only see the backups for your current configuration, unless you have a global backup directory path setup.

[rjpontefract]

Were they on a remote file system and/or a VPN?
No they were all in a local directory on the local SSD.   

If anything like this ever actually happened, you could go to File > Backup History Browser.
This actually saved me when it happened as the file I tried to save first ended up being 0 bytes on disk.

I'm hoping it doesn't happen again, but, if it does, is there any diagnostic info I can get for you?