Well it seems the original problem was fixed but now the same thing is happening in the advanced search area.
I was searching for this thread.
Double sided T-Shirt quilt
I knew I had "double sided T" in the title. I went to advanced search.
I entered double sided T in the keyword(s) field and selected "search titles only" from the drop down menu
I entered feline fanatic as user name and then I hit the search now button and got the below error again.
I also got the same error if I selected search entire post from the dropdown and also if I used upper or lower case for the t.
Oops! An error occurred: index BlogCommentDelta,BlogCommentMain,BlogEntryDelta and 7 more: no such filter attribute 'groupuserid'