I have never had this problem and the patch tool has worked great up until a few days ago.

Every time I use the patch tool now it seams to work fine but when you remove the selection you end up with a ring or artifacts or something where the marching ants were. When you try to use the patch tool to remove those it leaves more around those selections. It is becoming very frustrating and I use the patch tool all the time with my image editing.

I have tried reseting everything. I am on a brand new iMac with CS5. Any help would be great.