Hey Olivier, do you read my blog ? Here is the answer to your question, but this solution is not official
I was experiencing for some time a quite strange effect on my no so old installation of Windows Vista. After some dyas of usage without any reboot I sometime was unable to open any new window, it could be an explorer, internet explorer 7 tab, a menu of tray icon, and this without any error message. I first thought it was an issue with the video driver, but after too much annoyance I searched the web and found a post “Max Num. of Open Windows under XP/2003/VISTA - Resolved !‘ explaining the issue and a possible fix.
From Ohad’s WebLog
If you are using ASP.NET 2.0 CSS Friendly Control Adapters 1.0 with the Login controls of ASP.NET 2.0 you might have experienced some issue like multiple postback when using Internet Explorer. You might get a GREAT fix and explanation of the issue from Tana Isaac of Wellington, New Zealand.
Double Postback Problem - Cause (skip this if you just want the fix!):
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