The problem reported in this thread still occurs under Vassal v3.4.
Sadly it is not that simple as demonstrated in an online game that I had earlier today. I have created bug report to track the problem, along with a link to a version of the module to provide card counts.
I feel that it must be a Vassal issue, though the bug will not happen so much, or at all, in modules where card drawing is automated as this is less likely to be affected by synchronisation issues that I may lie at the root of the problem.
Mark (B)