---snip---

EDIT:

Just looked at the generation TX of last 100 Blocks:

From 86 of them the destination address was the same, which i assume is the pools address.
This means, although this is only a very rough estimations:

86% of the networks hashing power lies by this pool, and here we are: housten, we have a very big problem...

EDIT2:
Looking at the stats prooves this: http://www.coinmine.pl/qrk/index.php?page=statistics&action=blocks
Block Overview
   Gen Est.    Found    Valid    Orphan    Avg Diff    Shares Est.    Shares    Percentage    Amount    Rate Est.
All Time    308,642    176345    175056    1289    1,101.2280    48194144    67308505    139.66%    25459277.001874    57.14%
Last Hour    120    105    105    0    5,510.0801    144640    199012    137.59%    1680.0195    87.50%
Last 24 Hours    2880    2577    2576    1    5,958.9464    3837562    4721686    123.04%    41220.21616    89.48%
Last 7 Days    20160    17745    17743    2    4,733.0264    20994522    19637075    93.53%    283927.71958001    88.02%
Last 4 Weeks    80640    65543    65520    23    2,493.8772    40849708    44652365    109.31%    1643143.30782    81.28%
Last 12 Month    967680    176345    175056    1289    1,101.2280    48194144    67308505    139.66%    25459277.001874    18.22%

EDIT3:
And just to be clear:

i personally have no reason to distrust the pool operator, but thats a thing that needs to be fixed ASAP or bter38 will never come, and maybe otehr trading platforms will suspend Quark wich would definatly be a pity.