I am experiencing the same error. Here are the specifics:
Here is the page where that gets the error: http://www.qmsportals.com/Home/tabid/36/Default.aspx
When I hit the Home page it throws the error 9 times in a row. I have 8 top menu items including Host and Admin. After that the page renders just fine, links work. When you hover over a menu item on top or on a container it throws the error.
Two things that I changed yesterday may be the culprit. First, I installed IE7 to test my sites and everything appears to be okay. I have no other issues with any other sites or any other pages on the same site. So far so good.
I added the following meta tag to the home page under settings when I added the link to the ICRA. (There are two domains that point to this site)
I am running DNN 3.22 on a semi-dedi server hosted by WH4L. I have several third party modules installed but only one on this page. The TPM is the OnyakTech Live chat module which has worked flawlessly, and is probably not related.
The issue didn't start happening until I shut down the system last night and brought it back up this morning. I did reboot several times last night after installation and had no problems. I double checked the labels.xml file for the ICRA link and it appears to be just fine as well.
I thought I could just remove the meta tag info from the settings of the Home page but it throws the error every time I try to use the down arrow for Advanced in the settings page. At this point it looks as though I am going to have to recreate the home page and delete the old one. I currently have the home page set to a different page so as not to generate the error.
Any info on this would be appreciated.
Thanks in advance, John