I was having issues as well today. Switched to a different pool and everything seems fine over there. Not sure what's going on with 50btc right now.
Any one having any issues?
Hashing seems intermittent and low on my clients and the dashboard website is hopefully lying?
(Just swapped to a back up pool *not 50btc* and hashing is fine so I believe not my end)
Issues started about 3pm (BST)
We had minor problems in our data-center. So you may see some delays in share displaying. Never the less, all your shares will be properly counted and paid.