I am using windows XP SP2 and running adobe reader 8.1.2,
1)Open two PDF files in two seperate instance of reader
2)In any one instance search for some string not contained in the PDF file
3)after the search is completed, a dialog appears which says "Reader has finished searching the document. No matches were found."
4) Don't click OK
5) switch to other opened instance of Reader.
6) Unable to scroll or do anything in this PDF.