The testnet block explorer was up for hours and verified by comm members:
http://www.reddit.com/r/XCofficialreddit/comments/26yubh/block_explorer_for_yesterdays_test/
The only reason it was taken down is because testing is now over for the new wallet release tomorrow.
So by reading the timestamps in the reddit thread, the block explorer was active for around an hour then taken down? Hard to verify anything within an hour. What's the use of it if it was just active for an hour or perhaps not even up at all since everyone complains in that thread that it didn't work.