does Bittrex have the newest wallet? Contact to Bittrex.

I believe you are not using -I setting? My miner brings HWs witn -I > 10... But with I=10 and core clock 1100 it hashing not faster than 3.7 kH...

I use ultracoinminer. It just doesn't start at all with your settings... Are these setiings suitable for it? Or may be this is my main mistake and I should better use yacminer? ))

Use yacminer!

Happy mining 

Well, best I can take from my GV-R929OC-4GD is 3.5-3.7 K using ultracoin miner. The BEST value. With yacminer 4.5.0 everything is even worse. 14.6 drivers. Win 7 x64.

Thank you all for your advices. )

Once they update their wallets with the latest version your transactions should appear.  However, I would wait for news that they have updated their wallets before sending anything substantial.   I wouldn't send more than a coin or two at a time to test.

I sent 463utc with utc.tumblingblock.com on bittrex.com, but coins are not reached. Tell me what to do?
http://ultrabex.tumblingblock.com/tx/3728dcc9ce35ac2cdcdd47f90cd34813f66a596db0a1d88068d57613b6dd513e#o1

You can only wait until they update their wallet. It is always better to send to your wallet first and then to exchange, it takes only a few minutes and is much safer.

Mining has indeed improved, thanks guys.

The network hash rate is a computation based off of the difficulty using the average time of the last 120 blocks.

Span S = Block120Time - BlockTime1Time
AveTime = S 120
HashRate = Difficulty * 2^32 AveTime

It is not showing the current network hashrate.  It is only, and always has been, a computation based on the difficulty and average time, and is only an estimate.  It doesn't show what is happening now, but an average over the last two hours.   It will appear to pop during lucky streaks or increase in hash rate over the last 120 blocks as the difficulty goes up.  Because it is based on a longer time frame if we have a bunch of hash and then much less it takes awhile to correct.  Once the amount of miners stabilizes for a longer period of a time, so will the network hash rate.  As long as we have people hitting us and leaving us it is going to keep bouncing around with the difficulty changes.