As far as i understood the System, your Balance will increase when a valid block was found

See here: https://coinfoundry.org/de/pool/xmr

Depending on how much computing power u spended during the time a valid one was found, your Balance will increase.

had the same question...

http://poolmining.userecho.com/forums/1-general/topics/542-no-hashrate-for-active-workeraccount/

maybe it is caused by the Domain Name Change, i dont know and wait another day if it will appear

ok dann lass ich n mal wieder anlaufen, stats sind zwar aktuell wieder weg...schau mer mal

...just a few minutes after posting my statistics Show up again?! strange strange