Hey ! I have a zenbook with the same issue. I managed to isolate the App that crashes, so what you can do if after wakeup the multitouch is not working is the following:
ctrl+shift+esc (task manager will open)
the process that crash is : Asus Smart Gesture Center. (finish it)
That's it.
Since there's another Asus process that automatically opens the previous App. ( Asus Smart Gesture Loader)
Hope this help u !!
This worked perfectly for me, thank you so much!! I'm always grateful for folks who are willing to help us novices navigate our way around new (or not-so-new) technology.
I had the same problem, the 2 finger scroll suddenly stopped working, I didn't change any settings or anything. My laptop is new and I'm still getting used to it, and the scroll has already become second nature. I was really disappointed. Found this thread (and forum) on a google search. I'm sure I'll be back as I come up with more questions about how to navigate Windows 8. It took me a couple of days to figure out how to close an app without the X in the right-hand corner.