I've run into an event race when having the following configuration:
DestroyFunc LowerPager AddToFunc LowerPager + I PointerWindow (FvwmPager) Break + I All (FvwmPager) Lower EdgeCommand North All (FvwmPager) Raise EdgeCommand West All (FvwmPager) Raise EdgeLeaveCommand North Function LowerPager EdgeLeaveCommand West Function LowerPager
The problem is when moving from the north pan frame to the west. While being at the upper left corner the pager will keep raising and lowering all the time. This is due to the pan frame being raised under the pointer, thus creating new EnterNotify and LeaveNotify events.
/Viktor