My Print Screen key would take a screenshot of whatever was on the monitor with every version of LMDE up to UP4. Now after upgrading to UP5 it no longer works. I get a message "No command 33 has been defined".
naughty_bit, I didn't see your post till afterwards. I noticed the instruction to install meta cinnamon only after reporting the bug; then installed meta cinnamon and mate without re-checking Print Screen. i added command 33 in gonf-editor (which wasn't there after meta cinnamon installation) as suggested by escolar; and of course, it worked.