I have a form where a date must be entered.  I have defined a constriction
where only dates within a certail range are acceptable.  This application
has multiple client sessions running.  It runs fine than suddenly, the date
field will only allow the current days date to be entered.  this happens
only on one work station, but not always the same one.  the only way around
this is to bring down the client session and then restart it.  this corrects
the problem for a while but it will reappear.

Can anyone explain what's happening and what to do about it?

Thanks.