HTML view: Error when use Rich text mode

HTML view: Error when use Rich text mode

Hi,

If I try to make ANY changes using the rich text mode in my HTML view it gives me the following error:

Lexical error at line 1, column 12. Encountered: "\\" (92), after : ""

It doesnt even let me shift to plain text mode after this. All I can do is press cancel - but then my changes are lost.

Please help ASAP

Thanks