[SOGo] Thunderbird 3.1 and calendar blink

[Alessio Fattorini]

I have installed sogo 1.3.0  and last addons for tb 3.1 on xp and on ubuntu, every 2-3 minutes i see 
blinking of all calendars and events, like a reload.
I have set refresh every 30 o 50 minutes, but the reload is more frequently.
When i see this reload and i'm working on events, thunderbird stops to work for a few seconds.. it's 
annoying
Can anyone tell me why?
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