Nah that changed nothngdanzaharia said:Well visual studio added the reference, but it had two version of the system.web.extensions. One was the 3.5 and the other was the 1.0.61025.0. I removed the 3.5 since the developers i am collaborating with are using VS2005. I am currently installing service pack 1 for my 2005 install to see if that makes a difference. (According to the AJAX prereqs this is necessary.)wisemx said:*snip*