Sat Jul 09, 2016 5:50 am
There can be issues when using more than one monitor of the same type.
Sometimes on startup, one or neither monitor will be touch-sensitive, this is because OS X has taken control of a USB HID device before the Touch-Base driver. This is non-deterministic - sometimes it will work perfectly.
If this happens, unplugging the replugging the USB cables usually fixes it.
The HID devices are always present in the USB tree (About This Mac, System Report) but one of the devices will be red in UPDD Console, the Touch-Base configuration utility. It will go blue (normal) once the USB cables have been replugged and the monitors will then become touch-sensitive.
Touch-Base are aware of this and are about to release version 6 of their driver which has a completely new USB implementation.
There can also be issues if monitor configuration is changed. Once it's working, leave it alone (don't swap USB / monitor cables) and always make sure that both monitors are on before switching on the Mac.
One last thing, I've had issues connecting USB 2 monitors directly to Mac USB 3 ports. This is rectified by using a powered hub that supports both USB 3 and 2. I believe your monitors are USB 3, make sure you use USB 3 cables.
All the best,