If you switched to IE10 *and your *Knockout *bindings that previously worked in IE (8 in my case) now give you the following error: "String expected"*, you might want to check your bindings. Mine had a computed 'toString' member. I'm not sure what's happening but choosing the name of an existing, default member might not be a good idea.
Replacing it with something else (i.e. "description") and updating my markup fixed this issue. Just putting this out here in case someone else encounters the same problem.