I've put about 20 hours into just this problem and I'm becoming quite
frustrated.

From the link you provided I took this file content:
---
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework]
"MDA"="0"
---
Placed it in a file and ran that file.  Using regedit I see "MDA REG_SZ 0"
in the appropriate location.

I bring up visual studio, compile, entry debug, get the same MDA error on
the same line as before.
No difference, no effect.  As I said in my first note I can disable the
LoaderLock exception from the Debug/Exceptions/Managed Debugging Assistants
option, but that just causes the app to hang in the debugger.  Application
runs fine outside of the debugger.  Application runs in debug when compiled
and run on a different machine.  Last night I COMPLETELY removed VS2005 and
.NET 2.0 (and other 2005 components), then reinstalled.  Absolutely, no
change in behavior.

Following the MDA exception I get the following message:
"No symbols are loaded for any call stack frame.  The source code cannot be
displayed."

Basically, I'm getting an exception that is impossible to turn off but that
comes for nowhere.

Other "odd" (likely unrelated) problems with my version of VS2005

1) Tools/Options/Text Editor/C#/Formatting generates a panel with the
message "An error occurred loading this property page".

2) When I recompile I see the following warning:
Warning 1 'System.Configuration.ConfigurationSettings.AppSettings' is
obsolete: 'This method is obsolete, it has been replaced by
System.Configuration!System.Configuration.ConfigurationManager.AppSettings'
...

** There is only one problem with this ... THERE IS NO
System.Configuration.ConfigurationManager

The machine is a Dell that ran VS2003 fine.  VS versions 6, 7 (vs2003), and
8(vs2005) are all installed on this machine.

Help!

""Peter Huang" [MSFT]" <v-phu...@online.microsoft.com> wrote in message
news:FaC4sf7%23FHA.552@TK2MSFTNGXA02.phx.gbl...