Keyboard layout missing apostrophes

I've been using RDM in MacOS for a few years now. For a few weeks now, it has stopped typing quotes and double-quotes in my RDP sessions, all of them. SSH sessions are OK. I haven't changed anything in my local and remote setups.
Latest RDM, latest MacOS. I just tried the MS "Windows App" on MacOS and the keyboard works fine there.

Any ideas??