Is anybody else using Mac OS to run Axtime? I have 2 of them, one recently got upgraded to Sierra OS and it won't load the usb port for axtime to see it. The second computer is still running an old OS and no problems.... It's about the only thing I can think of that might be causing the problem.

Well, it seems like the problem was the prolific USB driver. There's a new version for Sierra.
JC

Yes, I had the same problem with Windows 10. Old prolific driver was the culprit.

I'm actually about to spend $20 buying a new, non=Prolific serial.USB connector just to avoid fighting with Win10 every time I want to use the old one.

USB Serial ports are the devil. I'm building a machine with real RS232 serial ports so I don't have to deal with them every year. Though, I've worked many years with RS232 and so my opinion might be just a tad biased.

This is why I keep running axtime on a dawg old Dell D830...onboard serial FTW! :-)