I just wanted to share that Rexxmast is not getting started in default 3.1.4 startup-sequence like I had it in 3.9. I didn't realize it was not started and it caused various issues. YAM install script is using AREXX and I was using AREXX in WHDLoad in a start-up/clean-up script to turn off my TCIP/IP stack. There were no warnings that RexxMast was not running in those programs -- instead I got a hang in YAM install script and WHDLoad games would fail to work correctly.
Now I have put it back in user-startup and all is okay. This is just FYI for anybody that is encountering same issue.