Unable to work with display:none elements

I have some code that involves using some HTML elements that are initially set to "display:none".  When I view this in design mode in VS2010 they do not display.  When I try to enable them (view/visual aids) the VS2010 studio just crashes every time.

I am now getting work done by setting them all to display:block (so I can see them while I'm working with them!), and when I deploy them, I have to go through the code (in source view) and manually turn them off.  Quite a PITA.  Does anyone have any idea why this feature will not work on my PC?