>Hmm. Couple of suggestions if you're not getting the information you need to trace the problem:
>
>Use ProcMon to monitor file activity.
>Eg: Filter on a path or 'Category is Write'
>
>As a stop-gap you could use SQLServer to manage session state (configurable in 'Session State' settings for the WebSite)

Good idea, thanks

>Also (I think) IIS7 allows you to monitor recycle events (Advanced Settings on AppPool / Generate Recycle Event Logs) which would make your code redundant.

That's why I do it in the code so it can be part of the framework.