already opened ticket on site
guess that they working now on this issue

275090 was already paid and back to processing aprox before 20 minutes

and 275087 not appears .

The daily reward graphs at
https://mining.bitcoin.cz/stats/graphs/
are one day delayed. The latest data point is for Nov 28, which is the day before yesterday (pool time, i.e. UTC).

It continues for several days already, but it can't last for too long. I've seen the last data being OK some days ago AFAICR.

Some longer time ago, all displayed data were shifted one day in the graph. In fact, the data points were OK (all data displayed), but their X-coordinates (date) were shifted one day. It is not the case now, today the data from the last (complete) day are missing.

the block has been mined during a minor maintenance, so the reward has to be calculated retrospectively. our guys are working on it and the reward will be paid out within few hours.

Is there the target share rate value for Slush's pool VarDiff publicly available?

From the FAQ: "...each miner is led to send results of its work to the server around 20 times per minute. That's the goal. If the miner is too fast, Vardiff increases the difficulty for its work and when too slow, the difficulty decreases."  So, no share rate target - that depends on the speed of your miners - but a target for the number of connections to the server, preventing overloading and incidentally protecting your own bandwidth.

? According to home page there is a 2% fee ?