No, I don't. I thought it might have to do with pressing Control+Shift on my laptop at first, as doing so changes my keyboard settings from "US" to "Canadian French" since I have a multi-lingual laptop, but once I couldn't type on my XP desktop, I knew it had to be something different because I only have one language on my desktop. But yeah to fix it, I just had to open RS in a new window. That didn't work. I tested this too, I only had RS open, and it suddenly happened; I couldn't use the keyboard despite not having any other windows opened. Anyway, since I have disabled Flashblock, I haven't had this problem, so maybe it was that extension the whole time.