I realize this was an issue a couple patches ago, but my rune pages are limited to two again. I noticed a couple hours ago I had all of them. Logged off and then logged back on. A couple patches ago, it left the first two rune pages on my list, and deleted off the other eight. This time, it left the last two on my list, and deleted the other eight (if that gives any relevance).
I've tried logging off and back on again, but didn't seem to fix it, and it won't let me create or purchase (gives me a message that says an error has occurred while processing the request) any new pages.