Do you have Neon installed by chance?
try disabling it and see if that cures it.
Also do you have the latest Rhino Beta installed?
I had this problem and I uninstalled Neon and it went away.
"I'll use whatever you guys at McNeel decide.
I've been using Rhino before V3 was released, and have never had any complaints about the old school newsgroup.'
All this extra stuff is nice, but I can see it becoming even…"
"There are a few options that aren't saved in the "Export Options" command.
Two I know of right off the bat are, "Files Search Paths" and "Script Files To Load When Rhino Starts up", unless something has…"