Thanks for your reply Dan.
When using ver 6 in 12 hour mode, every night at midnight the module jumps to the next night, skipping 2 periods. Example; today is Tuesday - tonight it will work correctly until midnight, at which time it will show the forecast for Wednesday night, skipping Tuesday night and Wednesday all together. Somewhere around 6 AM it will again start working correctly until midnight. It works fine in 24 hour mode.
Also in 12 hour mode, several times throughout the day, the forecast module will disappear completely and come back a while later - no specifics on time as it just seems to happen. I don't believe that is happening with the 3 hour module at all. All of the issues seem to be in 12 hour mode. I can check sites I'm running the older version on when this occurs and they all continue to work correctly.
As of a couple days ago, I've changed to 24 hour mode to keep from having the disappearing module syndrome.