I ran PageSpeed on my site and one of the alerts says
Resources with a "?" in the URL are not cached by some proxy caching servers. Remove the query string and encode the parameters into the URL for the following resources
So I'm curious, is there any reason why CodeColorer needs to report its version? How common is it exactly for a proxy caching server to not cache the CSS file because of this?
If it's not that common, then I have to question why PageSpeed is dinging my site (and presumably many others) over it.