TeensyLC USB Serial works on OSX, but not on Windows

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JasonH

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I have a program where I wrote some code in Qt on my Mac. My co-worker is trying to run it on Windows 10.
We expected to have to change the serial port name, which we did, to COM4. Teensyduino IDE sees serial traffic from it on Windows.
However, the program writes data to the teensy and expects it to reply back. The program reports having written the data but no reply is received. The Teensy is hooked to a contact switch and it's supposed to send a status message when this happens. He can see characters in the terminal. But when we do it with Qt listening on the serial port, no readyRead call back is called.

Any help would be appreciated. It works like a champ on OSX, so I am thinking it is a windows driver issue?
 
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