Hi,
I got the same error. I have Windows 2000 SP4 and IE 6 SP1.
I clear IE cache and when I try to load a page of the AjaxControlToolkit (and on my own web site), it works on the first page but it does not work anymore then (after postback or going to another page).
So I try to use configuration of ScriptResourceHandler in web.config and I notice that when I disable compression (and caching in the same time) with :
<system.web.extensions>
<scripting>
<scriptResourceHandler enableCompression="false" enableCaching="false" />
</scripting>
</system.web.extensions>
Then it works just fine, it is a work around, but it is a pity if it is impossible to use this fonctionnality that increases performance.
I noticed also that when I change enableCaching value, it does not change anything to the Expires header, it is always one year more the date the resource was requested. I will write a post on this bug.
Can you give me your opinion and test these problems.
Thanks
Clément