The sun was  mostly mundane during the month of December 2006. There was more activity after the supposed historical Dec 5th flare than during. When they don't want you to see something, they either add noise or block off part of the image. The only notable activity was at the very end of December but apparently not noteworthy by SOHO.

Dec 20 - 31  2006
Dec 20 0006 - 0354
Dec 20 0406 - 0754
Dec 20 0806 - 0954
Dec 21 1006 - 1354
Dec 21 1406 - 1806
Dec 21 2112 - 2354
Dec 22 0030 - 0830
Dec 23 1230 - 2030
Dec 23 2230
Dec 24 1130 - 2330
Dec 25 0330 - 0930
Dec 26 1106 - 1706
Dec 26 1854
Dec 27 0054 - 0506
Dec 27 0654 - 0908
Dec 28 0330 - 0930
Dec 29 1130 - 2330
A fairly large flare seems to have appeared on the last image but it did not set off much notice by SOHO
Dec 30 0530 - 1034
The flare continued for about 22 hours
Dec 31 1130 - 2330