I have the same issue with version 4.31 native Linux / GTK of Express Scribe under Ubuntu. I tested it on an old installation of Ubuntu (I think it was 7.10) and was very impressed with the software. Got it working with VEC Infinity pedals (USB) and Spectra headsets. Ordered quite a few more pedals and headsets knowing all worked. But in the meantime I had to upgrade Ubuntu and guess what. When I got the hardware I needed to go live throughout my little organisation Express Scribe did it's jump ahead trick (described in posts above) regardless of whether I used the pedals, the mouse or the hot keys. So I tried version 4.31 Windows under Wine (having first installed Wine). The software loaded and ran and didn't jump ahead BUT I couldn't get it to recognise the presence of the VEC Infinity USB pedals (which are working as evidenced by them functioning under the native Linux version although the end result is wrong, that's not a problem to do with the pedals). I am hoping to get a copy of version 4.11 to try that out. I would love to hear from any Ubuntu users of Express Scribe who have it working correctly with pedals. Please, what version(s) of Ubuntu, of Express Scribe (version number and Windows version under Wine or native Linux / GTK ) what pedals are you using and any setup required in Wine or in Express Scribe or any drivers required for the pedals. It's frustrating being so close to a great solution to a business need.
Thanks for any help on this.