It works fine on files mounted through gvfs/fuse but not those mounted using the fstab/mount/cifs method.
As an example, Findstuff.txt is the same physical file on a Buffalo NAS mounted two ways.
Mousepad can't open the file mounted using fstab
-rwxr-xr-x 1 myusername myusername 182 Oct 5 15:53 /home/myusername/ls-pro-public/Debian/Findstuff.txt
Mousepad opens the file just fine mounted through gvfs
-rwx------ 1 myusername myusername 182 Oct 5 15:53 /home/myusername/.gvfs/public on ls-pro/Debian/Findstuff.txt
Every other program I've tried will open both files ( leafpad, vi, Libre Office Write, nano)
I get no error, Mousepad just opens a new empty document called Untitled 1
Oddly, I can create and successfully save a new document to the cifs path, but then can't reopen it.
Any ideas what to look for? I can't find anything in the logs.