Hey there,
I am experiecing the same problem with ArcPad 10. Specifically when switching between drawing features (i.e. manhole to tap). Occasionally a low vitual memory warning will appear and then go away, but after I capture 10 or so features ArcPad locks up with this error report "WinCE501bException" and I have to shut it down. It has been getting progressively worse, to the point now where I can only capture two objects and it locks up. I only use two background vector files and the file I am editing in is also vector. The physical memeory on the device is barely used. Any answers or solutions would be greatly appreciated.
Thanks,
Nick