I have a situation that I have encountered on my site. One of the high PR pages on my site (I shall call it page4.aspx) has been ranked well in Google SERPs. The keywords that is pointing in page4.aspx is positioned in 3rd / 4th place of Google SERPs. I made a move to change the Meta Description of page4.aspx. I took out 1 word and changed the spelling of the other word of the Meta Description. After the revision of the Meta description, the rankings of the keywords that is pointing to page4.aspx has dropped to page 3 and page 4 of Google SERPs (from position 3 to position 23 and 34). Did it drop due to the revision of the meta description? Is the dropping of the keyword rankings will take a long time to recover or will it come back up again?
I change the description last September 28, 2010 and the dropping of keywords took place in October 5 or 6, 2010. Right now the keywords has not recovered yet.