Hello,
Right now the PDA products are not active in development as they are feature complete and stable. We are working on the next version of Logbook Pro and other related development. The PDA's will be back in development in a few months and we will certainly see if we can find anything, however, we have run all tests on Windows Mobile 6 but something specific to a device that may be a problem is very hard to isolate without have that exact device. We test on various emulators as well to give us the widest reach in testing.
We offer all of our software on a try-before-you-buy basis allowing you to download software and use it to ensure full compatibility and satisfaction prior to purchase. This also allows people to tests new phones/devices within a return period by the provider. Make sure the keyboard is configured as desired and not in a function lock mode that is causing a problem as you describe.
I wish I could help you further but there is nothing we can do and have not had any other reports as you describe.