Ical can't add events to Exchange only if I change the time zone

Hi, I recently update my MacBook from Snow Leopard to Lion (10.7.3) and I was using iCal with Exchange in my organization without any problem, but now I cannot add events, I get a message saying that iCal can't add the evento to Exchange, and it gives me 3 options Cancel, Restore or Redo.

I search in the forums for this message but none has come to a posible solutions, but I found a discution that someone enable the time zone support and specifies a diferent time zone in the event and "voila" it fixes the problem, the events now are added to Exchange; but obviously this turnaround is not good because the meetings you have to mention the difference in the time to get a meeting done.

Anyone knows how to report this situation to Apple Support?