IE9 throws an error message:
SCRIPT438: Object doesn't support property or method 'setProperty' svg.js, line 1 character 319
The above message appears in the IE debugger for every page except those loaded by a refresh/reload.
A fix is here (but still testing with other IE versions and browsers): http://code.google.com/p/svgweb/issues/detail?id=616#c3
Edited original to correct problem description and "better" resolution.