Production Calendar problem

Hello all,

I am struggling with an issue in using the Production calendar. (we are
still using version 3.0) I can not save any changes I make to it. I will
add in a holiday, or a Saturday, and I come back, and none of my changes are
saved. I recently broke up most of our machines into their own work
centers, to make scheduling easier and the loads more accurate. Could that
have caused a problem? Changes will not save in either a custom or the
plant calendar. Is this a technical issue? Please help.

Jim Selinger
Production Scheduler
Bley Engineering Co.
Elk Grove Village, IL