Donald,
I got your e-mail reply to this thread. Windows CE 3.0 is Pocket PC 2000/2002 which .NET Compact Framework 2.0 does not support. You'll have to stay with 1.9.9 (both on PC and PPC) or treat yourself to a newer Pocket PC that has Pocket PC 2003 or later.
Logbook Pro 1.10.18 (PC) is NOT backward compatible with 1.9.9's Pocket PC, contrary to what I expected previously. I just checked the code and it won't work. I have adjusted the code so when the next version does come out (maintenance update) which I don't anticipate any time soon, it will then be compatible. One glimmer of hope, we are getting quite a few reports of APDL sync issues and if we do find this to be a problem in the software, it will trigger an update and you'll be in luck! As I may have mentioned, I have already recoded the PDA Wizard so it will be backward compatible, but again, I don't anticipate an update in the near future unless other elements warrant the update.