I followed the directions to install the syntax highlighter for Scheme
files; doing so with UAC disabled (on Vista).
VS08 starts, I can see syntax highlighting on the Scheme files, and
then VS08 halts and dies.
Any ideas where I can start debugging this?
Do you have VS2008 SP1 installed? There is known problem with not applying the service pack. It has to do with the navigation drop downs in the editor.
Try disabling Navigation Bar under Tools/Options/Text Editor/IronScheme/General. Perhaps disabling other options can work too? I have never been able to test this on a non SP1 system.