slush's pool

Let me start by saying that I have followed bitcoin forum for a long time, it's just that I did not feel I had anything to contribute until today, hence I registered.

The reason I registered is that I have a slight problem with Slush's pool, and these restrictions that do not allow me to post into support forum frankly make no sense at all.

Moderators are you reading this?

Anyway my questions is the following:

15684   2013-01-10 15:31:18   1:14:10   Processing...   216012   N/A    99 confirmations left
15683   2013-01-10 14:17:08   0:49:47   1794871   0.02226872   none   216005   25.20392737    92 confirmations left
15682   2013-01-10 13:27:21   1:19:00   2811394   0.00000001   0.00000004   215998   25.50487800    85 confirmations left
15681   2013-01-10 12:08:21   0:46:50   1658967   0.02361847   0.06842824   215993   25.40350000    80 confirmations left
15680   2013-01-10 11:21:31   0:19:19   716126   0.02015602   none   215988   25.14154000    75 confirmations left
15679   2013-01-10 11:02:12   0:13:29   509978   0.02030828   none   215983   25.31470000    70 confirmations left
15678   2013-01-10 10:48:43   0:10:50   411069   0.01942573   0.05441909   215981   25.32810000    68 confirmations left

Why did I receive only 0.00000001 BTC for block 215998?
Mining rigs seem to have worked properly before and since....