http://bugs.winehq.com/show_bug.cgi?id=807
------- Additional Comments From bruce.armstrong@teamsybase.com 2003-06-08 14:45 ------- Avoid date masks entirely. That appears to be the issue. You might try using a date format instead, so that the format is applied after the user enters data, but they aren't forced to enter it into a mask.
However, 6.5 is also a rather old version of PB. In fact, 7.0 has already been desupported. Have you tried with a more recent version (i.e., 8 or 9)?