I don't understand WHY version 3.2 always reported that I had the latest version and did not need to upgrade.
The "Check for Upgrades" function has been broken since v3.228, which was released 9/5/2008. It is a server-end problem, but they haven't been able to fix it for some reason.
What version were you using before you upgraded to 3.318? If you have any older (non-softStart) lamp modules or dimming wall switches, you should re-define them in AHP using the "Old Lamps - no SoftStart" module type.
It is easy to check if they are SoftStart or not. When you turn them on, if they slowly ramp up to full brightness, they ARE SoftStart. If they instantly go to full brightness, they are NOT SoftStart.
If you have both SoftStart and Non-SoftStart modules, you should make sure they are not on the same Hoousecode / UnitCode combinations. That can lead to some unexpected results.
You can see the entire (user-maintained) bug list here:
http://forums.x10.com/index.php?topic=22373.0