>>Have you resolved the issue? When I was loading UT I noticed google syndication at the bottom.
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>It took me a while to figure out that one. I thought I had this when only Google syndication was called. But, this morning, I found out that I had a few errors like that even if the Google syndication was not called. So, I started to investigate more and more until I realized an important issue. When that script is inserted in a page, when the page loads, at the same time, a call is sent to Google robot. The Google robot then sends in another requests to read the page content so it could then decide on which ads to insert. So, basically, there are two hits per page when this is effective. I always investigated on this as if it was related to my hit but I just realized this morning that the error was caused on the second hit sent by Google robot. After that, it only took me a few minutes to locate in the code where the problem was. Because, when that happens, because the hit coming in from the Google robot is not authenticated into the site, this will take a different route.
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>So, at one location, I had a string length comparison and I forgot to include .Length. The only think I don't like about that error is that is doesn't give me the stack trace. If that error would give me the stack trace, I would have been able to locate that sitation much faster.

Great detective work! I'm glad you solved this problem.