My reward was also "cut in half".
I raised a ticket, and things will be sorted out as usual.
Yep 22106 was also half here.. email sent to support:)
My payout was lower by 18% relatively to the proportional number of my shares. A possible explanation to this is a sudden rise in the pool hash rate towards the end of the block, which decreases the payout of all the other miners (but at the same time make a significant contribution to solving that block faster). Let's try to illustrate this with an example:
The pool hash rate= 1800000 GH/s Your hash rate=200 GH/s your expected reward=0.002777778 BTC
Now assume that Miner X joined the pool with 200000 GH/s a few minutes before the end of the block, due to Slush's 'anti-hopping' algorithm, Miner X's contribution receives almost full 'weight' despite occuring towards the end of the block, so the increased short-term hash rate at the end of the block is now 2000000 GH/s, your reward drops by 10% to 0.0025 BTC. This is not due to any 'fault' at Slush. Actually it might have been caused by a technical or other problem on one of the competing pools, which caused briefly a massive shift of miners to Slush as their 'backup pool'.
Just my 2 mbtc.
Enjoy the recent burst of solved blocks, which more than compensates for that 'disaster'...
My understanding was that the calc, assuming you are mining at the time the block is found (you havent had a blip in providing hash rate etc) is my shares / pool shares * Block Value.. for a rough calc. (not deducting fees here)
therefore for block 22106 :-
22106 2014-05-19 16:30:41 11:23:16 18010425802 3586935 0.00206705 301575 25.10258983 97 confirmations left
which makes the calc 0.0049994
The three previous blocks using the same calc would have been :-
22105 I get 0.0048193
22104 I get 0.0049920
22103 I get 0.0049467
All very similar and in fact almost identical to what was paid out, as were the 4 blocks post 22106
Whilst I appreciate your point about another pool jumpin in, to halve the rate paid it would have had to be approx 1872607.589 Ghash/s jumping in.. approx the rate when the block was found I believe, to drop it 50% and the your shares / total shares dont give those values, and we have also had reports of people getting double payout on that block, so something is not quite right.
This has been happening a lot since we moved to 60 minute averages, in fact one block, for me, dropped from .0048 as the calc to 0.0009 as the reward.
Whilst I appreciate your suggestion, I think something more drastic happened in this case and may be symptomatic of other blocks like this in the recent past.
I know it's not a huge issue, but when you only make 0.1 BTC a week (on average), it's a bigger deal
PS dont get me wrong, I love the block count this weekend, and I love this pool, but if theres a possible issue, I think it's only fair to investigate to see what actually happened.