Dirk, I've narrowed it down to ASP.NET projects with Glimpse installed. I created two ASP.NET projects, with and without Glimpse, and the error appears in the project with Glimpse, but the project without Glimpse has no issues. If I remove the Glimpse package, everything works again...
The Glimpse forum reports issues with this particular exception, for which the current release has a patch called the Async Patch:
http://blog.getglimpse.com/2013/12/20/glimpse-asp-net-1-7-released-cache-tab/
I've tested the release with the web.config setting, and the "broken" ASP.NET project with Glimpse starts to work.
Thanks again for your help!
Greg
The Glimpse forum reports issues with this particular exception, for which the current release has a patch called the Async Patch:
http://blog.getglimpse.com/2013/12/20/glimpse-asp-net-1-7-released-cache-tab/
I've tested the release with the web.config setting, and the "broken" ASP.NET project with Glimpse starts to work.
Thanks again for your help!
Greg