>>OK. That wasn't clear. To be sure: you're saying a DLL was replaced immediately prior to each occurrence of 'Application End' ?
>
>Yes, for that part, everything is ok.
>
>>Application_Init() does not exist and Init() is not an event - its an overridable method. Are you saying that with the above code in the global it never gets called?
>
>Ok, that explains why it was not going into that one. I saw that one on the net so probably they made a mistake on the code over there.
>
>>Also, as per yesterday, I'm not sure that you have really narrowed this down to something that only happens when the application re-cycles. Unless you try with the long-running page and over-lapping hits and never get the problem it's not proven.
>
>I will try to find more information on this.

Not a particularly useful bit of information but interesting:
Below is a log where I hit a 'slowed down' page several times in succession resulting in 8 instances of HttpApplication being created. You can see that, given a subsequent period of inactivity, they were released at the rate of one every 30secs (except for the last which was only destroyed when I shut down the app). I have no idea what controls the release rate and it doesn't shed light on your problem - just interesting....

Application Start: a3bab3c2-0eb7-4332-85aa-f0ed2222af05 at 13/07/2010 17:51:51
 Application Init at 13/07/2010 17:51:51

 TestForm New at 13/07/2010 17:51:51
 Page_Load at 13/07/2010 17:51:52

 TestForm New at 13/07/2010 17:51:58
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Application Init at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:51:59
 Page_Load at 13/07/2010 17:51:59

 TestForm New at 13/07/2010 17:52:00
 Application Init at 13/07/2010 17:52:00

 TestForm New at 13/07/2010 17:52:00
 Page_Load at 13/07/2010 17:52:01
 Page_Load at 13/07/2010 17:52:02
 Page_Load at 13/07/2010 17:52:03
 Page_Load at 13/07/2010 17:52:04
 Page_Load at 13/07/2010 17:52:05
 Page_Load at 13/07/2010 17:52:06
 Page_Load at 13/07/2010 17:52:07
 Page_Load at 13/07/2010 17:52:08
 Application Dispose at at 13/07/2010 17:52:50
 Application Dispose at at 13/07/2010 17:53:20
 Application Dispose at at 13/07/2010 17:53:50
 Application Dispose at at 13/07/2010 17:54:20
 Application Dispose at at 13/07/2010 17:54:50
 Application Dispose at at 13/07/2010 17:55:20
 Application Dispose at at 13/07/2010 17:55:50
 Application Dispose at at 13/07/2010 18:29:26
 Application End: a3bab3c2-0eb7-4332-85aa-f0ed2222af05 at 13/07/2010 18:29:26