lucy24 - 8:43 pm on Dec 4, 2012 (gmt 0)
It's not google, it's the internet as a whole. All "special" characters are percent-encoded in transit.
3. Do the percent encodings show up in referers or in the primary request?
4. Do the pages, with normally formatted query strings, exist? Not via "fetch as googlebot" but if you paste them in directly.