Fresco touch gestures stopped working

Hi all, I have been using Fresco on a Microsoft Surface Pro for a few months now without issue, but today the touch gestures started playing up. The pinch-to-zoom gesture seems to have completely stopped responding. All the other tools still work perfectly though, no lag etc.

I tried updating Fresco to v1.5, updating Windows, checked drivers, downgraded Fresco back to v1.4 all to no avail. I use Lightroom and Photoshop too and pinch-to-zoom works fine there - it seems the issue only applies to Fresco.

Would love to hear if anyone has some suggestions on how to solve this - can't wait to get back into drawing soon!

Thanks very much!