I've had issues the past few days with my account only showing a blank page, checked from several rigs but the same problem. My account has shown since this morning though.
At the time, I could sort of verify I was mining by seeing that I was getting shares accepted and still receiving payments to my wallet.
With the influx of new users and investors, the block explorer has been struggling to keep up. Luke is planning to improve on this in the near future. Unfortunately when it goes down the stats page doesn't work on the pool, and Angel is working on finding a different place to pull pricing from so this is less likely to happen.
These are good problems to have though! This means that more users are getting involved.
Luke has made some improvements to the block explorer. TLDR is some things weren't optimized too well such as some database lookups. It should all be working better now.
malware has been detected here: UBQ/Bitrrex =russian haxxors?hmmm ===> http://www.kitv.com/story/35448829/why-the-massive-cyberattack-wont-make-the-hackers-rich