Zimbra desktop 2.0, 2.0.1 systematically shutdown when a schedule warning came

[nlebihan]

OS: ubuntu 8.04 (or 10.04 LTS)
Zimbra desktop 2.0 or 2.0.1
Zimbra server network enterprise 6.0.6_GA_2330
java -version= 1.6.0_18 OpenJDK (IcedTea6 1.8.3)


Hi,
After installing zimbra desktop (tried with 2.0 and 2.0.1 versions) and configured an account, systematically when a warning about a coming/past schedule meeting warning come (pop-up), both the zimbra desktop and/or the firefox browser close brutally.

What can we do ? What trace could we give ?

Best regards