This problem sounds suspeciously close to an issue ("bug") in Visual Studio where running a project off a share drive will cuase issues if you are referencing 3rd party controls.
The following forum thread contains some helpful reference material and links to possible solutions.
<a href="http://forums.basicdatepicker.com/forums/permalink/1092/627/ShowThread.aspx#627">
http://forums.basicdatepicker.com/fo...hread.aspx#627
</a>
I think you should be able to confirm whether it's this share drive issue or not by adding the following <trust> node to your web.config.
Example
<system.web>
<trust level="Full"/>
Please let me know whether this information helps solve the problem. I'm going to try and put together an article summarizing this information because it is a fairly common problem.
Hope this helps.