ssjxxx - 5:29 am on Nov 22, 2005 (gmt 0) -S
Has anyone else had this problem?
Yes. There has been a lot of movement ("flux") in the SERPs lately. We have been told to expect this.
Will it fix itself eventually? (if anyone knows)
Yes, things will settle down a bit soon.
When it's using the more recent cache will it move back up or stay where it's dropped too.
That depends on where the new algo puts you in the SERPs. There are no guarantees here.