Mac issues with 1.3.8

I've tested the 1.3.8 release with Mac.  The Alice-Desktop software works OK, but the dc-meter-source-tool-1.3 code hangs with the spinning circle of death whenever I click "Run".   I've tried it on both High Sierra and Mojave.

I hacked a version of 1.3.7 to work with Python 3 that worked fine.

Not sure what other information I can provide.