We used iAnnotate this summer with a large PDF file - 904 pages - no problem. But now when we import a similar doc, iAnnotate frequently shows a "checkerboard" page when we navigate through the doc (using links, goto page#, etc.). We have optomized the PDF a number of ways and still we get the checkerboard. We have allowed the document to fully process (at least it appears to be fully processed). The checkerboard shows up with last summer's version 1.5 and with the new version 2.0. Any ideas?