There's a tab at the bottom of the Messages window, selecting between System and Processing messages. Is it possible you have the wrong one selected? I'v never heard of no messages showing.
Also, at the top, there are options to filter the messages based on type or string matching. Maybe those are modified so nothing matches?
Thanks for responding RScov. Yes we've played with all the tabs and options on the Messages window to no avail. We also contacted our local Intel FAE, TWhit, and he has us checking to make sure we met all the operating system prerequisite requirements before we go any deeper. The IT team just recently stood up this lab network and it's possible they missed some patches along the way. We are using RHEL7.7 (Maipo) on our workstations.
No screen shots available due to proprietary net. We also pulled down the Compilation Report and look at Messages tab and it looks like the GUI tab which is empty.
We are running 2019.4 on Linux and 2019.3 on Windows and the Windows Messages are fine and normal. We will be opening a support case.