Hi Doug
If one PC is working and connecting over the same method (LAN) then it is almost certainly something on the PC (and Mac) is configured differently.
The best thing to do is look at the log file on each machine Log file | wfview you can always post the log files here if you want us to dissect them for you.
We have found that certain soundcards use higher sample rates (96/192KHz) which wfview hasn’t been tested at, so it may be worth manually setting the sample rate to 48KHz. This is done in the Sound Control Panel in Windows 10 and Applications/Utilities/Audio MIDI Setup on MacOS.
73 Phil M0VSE