Calendar appointments change time by one hour after DST

[nglacet]

Hi.

I'm a new user of zimbra and I have a bug to solve.
I'm using Zimbra 6.0 (apparently) installed on a Ubuntu Karmic and we have a problem with the DST.
I read that some people had the same problem in 2007 with an older version of zimbra.
But we still have the problem.

Some collaborator have recursive appointments and after the DST, all those appointments are 1 hour after/before the right time.

Do you have any information on this problem for me ?

Thank you.

(Sorry for my poor English)

EDIT : After the last DST (few days ago), there were no problem. Topic can be closed