After converting a VB web site from VS 2008 to 2010, and from FW 2 to 4, I now get these errors at seemingly random intervals while running in the debugger:

CultureNotFoundException Culture is not supported. Parameter name: name uploads is an invalid culture identifier.

IOException on The process cannot access the file 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\Tem porary ASP.NET Files\surveys2011\7a4c2fbb\77a19308\uploads\e22oc1ye.post' because it is being used by another process.

UnauthorizedAccessException to Access to the path 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\Tem porary ASP.NET Files\surveys2011\7a4c2fbb\77a19308\App_Code.r_d39 7sv.dll' is denied.

Sometimes they appear, sometimes they don't, but they seem to occur when redirecting. Sometimes I get just one, sometimes I get seemingly random combinations although I tend to see multiple IOExceptions. I suspect the first two problems are related since they both reference the term "uploads", although it's not clear what it thinks I'm uploading or what other process is using this ".post" file, whatever it's for.

Is there some switch that didn't get set when I converted this program that would either fix this or suppress it in the IDE, because every time one of these errors pops up the IDE stops running and displays the "No source available" tab. I then have to close this tab and click "Continue" on the error dialog message. It's taking forever to run through just a couple of pages with it breaking every few seconds like this!

Found it: turn off exception breaking under the Exceptions option on the Debug menu.