Thanks for the reply.
I have contacted Juniper about this issue, and they sent me some info about changing the keys in the registry to get the vk_control....but I'm not real interested in messing with the registry.
Also, this only seems to be a problem with ArcPad 10 (I did not test on 8), as I can get it to work in 7.1.1 by opening the SIP and tapping the "Ctl" button on there...then snapping works. In ArcPad 10 I cannot open the SIP while working with the map (ie using the snapping tool) only when I open a form of some sort.
So, my next question is: Can I open the SIP in ArcPad 10 while working with the map?