After upgrading server from 3.0.6 to 3.0.7 (RHEL 7), altgr stopped working from the client: on my keyboard altgr-4 should (and did) produce $ but now produces 4. After upgrading client from 3.0.6 (python 2) to 3.0.7 (python 2) the problem is still there.
Client runs on Windows 10.
This is already fixed and will be included in 3.0.8.
For more details and a workaround, see ticket:2648#comment:8.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2687