SharePoint 2010 HttpModule problem

I'm trying to write an HttpModule to run on our SharePoint farm - essentially it will check whether the user is authenticated and if they are it will validate some info against another database and potentially redirect the user to sign a variety of usage agreements.

Whenever I enable the module in the web.config I'm finding that SharePoint has issues rendering the page - it's almost like the CSS is not getting loaded as the page is devoid of any styling.

As a test I've even tried an empty module - i.e. an empty init block so it's not even hooking up any code to any events and the same issue arises. At 开发者_如何学Pythonthis point it's an empty class that just implements IHttpModule so it's not even my dodgy coding causing the issue!

The module is in a class library that I've dropped in to the bin folder of the application it needs to run against. In the web.config of the app I've simply added an entry as below:

<modules runAllManagedModulesForAllRequests="true">
  ... (default stuff ommitted)
  <add name="SharePointAUP" type="SPModules.SharePointAUP" />
</modules>

I must be missing something really obvious here as I've done exactly the same as every sample I've found and yet I'm getting this strange behaviour. Is there something extra I need to do to get SharePoint to play nice with a custom module?

UPDATE:

In case it helps - this is SP 2010 beta running on Windows 2008 R2.

UPDATE:

The set-up I'm running against is a farm - 2 front end servers with NLB & 2 app servers with services split across them.

After listening to a nagging feeling this morning I've tested my handler on another installation we have which is a standalone set-up... and everything worked perfectly. The issue only exists when deploying to a farm.

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make sure to include a precondition attribute

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I came back to this after reinstalling the farm with the RTM - everything worked fine. I've written it off as beta issue (along with many others that I had with SharePoint if you've seen my other questions!).