OK I'll see if I can create a small example that shows the problem.
I am using Password Gorilla. In preferences->defaults I already had the box checked for "use password safe 3 format" but this evidently is not sufficient. Under the security->preferences menu I just found another check box, "use password safe 3 format" and when I checked this box, it actually did save the database in v3 format. And this did eliminate the crash when opening the database on android. So case closed, thank you for the help.
crashes with UnimplementedConversionException