As most of you know, the strange blobs seen on the SOHO images are little bits of insulation flaking off and are temporarily caught in the imager's field-of-view. We've seen this type of debris many times. Official explanation here:

[link to sohowww.nascom.nasa.gov]

The same sort of thing happens with the STEREO spacecraft as well:

[link to stereo.gsfc.nasa.gov]

More on LASCO debris:

[link to lasco-www.nrl.navy.mil]