Unable to Save As

Using LO Writeer on Windows 7 x64.
I’m unable to use “Save As”. I get error:
Nonexistent object.
Path to the file does not exist.

From the “Save As” panel, LO can even create a new folder, but then I get the error when I try to save the file into that folder. So it does not appear to be a network nor permissions issue…

Solved. If I save the file with a # in the filename, I get the error message.
If I rename the file, adding a # into the filename, and then re-open in LO, it works fine and is able to save updates.
Go figure…