KDE Plasma 5 on Fedora 22 - clicking desktop link to .odt (or .doc) file fails to launch OpenOffice

Recently this started happening for no apparent reason: If I click a desktop link to a .odt or .doc file (and presumably others), I get a warning dialog that says: This will start the program openoffice4 -writer %U If you do not trust this program, click cancel If I click "continue", then I get a dialog with this error message: Unable to make the service OpenOffice 4.1.1 Writer executable, aborting execution This was working fine for a year or so, and only just suddenly start showing this behavior. I didn't make any changes that I can think of, that should affect this. The googling I've done to date doesn't turn up anything helpful either. Any idea on how to resolve this? If it helps, I can start openoffice just fine from the command line, and Iv'e confirmed that the program files in /opt/openoffice4 (like swriter, etc) have the executable bit set. And the current user is the owner of those files as well.