Dear Ben,

As I understand, you are working with Visual Studio 2008, when you try to
edit the properties of a HTML control or ASP.NET control on a HTML page or
a master page, the Visual Studio closes directly.

I did some test and Visual Studio works fine on my side. Here are the steps
I tried:

1. Open Visual Studio Team System 2008 RTM;
2. Create a new ASP.NET project;
3. Add a HTML page to the project;
4. Drag a HTML button from the toolbox to the HTML page;
5. Right click on the HTML button and select "Properties";
6. Change value for a property, for example the "Value" property;

If  you follow the steps above, do you still have the problem? If the
problem still exists, we can try the following things to isolate potential
causes.

1. Click Start button and select "Run...", type "devenv /ResetSettings"  
and press Enter key.
   This will eliminate the related potential settings problem.

2. Try disabling third party Add-ins or packages.

     This is can be done in either of the following ways:

      a). In the Visual Studio, selecting the "Tools" -> "Add-in Manager"
menu, uncheck all the add-ins;
      or:
      b). Click Start menu and select "Run...", type "devenv /SafeMode"
and press Enter key;

      This approach can eliminate the potential impact caused by third
party Add-ins or packages.

3. Try rebooting the operating system to safe mode.
    This can help to isolate whether any other applications are
interfering with Visual Studio.

4. Try to create a new user account.
    This can help isolate user profile corruption related causes.

5. Try completely uninstalling the Visual Studio 2008 and install it again.

      For how to uninstall the Visual Studio 2008 completely, please refer
to this document:

      Uninstalling Visual Studio 2008
      http://msdn.microsoft.com/en-us/vs2008/bb968856.aspx

Please try these approaches and let me know whether they helps or not.

I looking forward to hearing from you.

Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team

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