When viewing a PDF with Reader 9 the document is very often covered with a large black box or text may be missing. However, when I zoom in to actual size the document appears as it should. If i zoom back out, other elements of the document may disappear or more black boxes appear. There are no problems with printing.
The same documents display and print ok with Acrobat Professional 8.0 installed on the same machine.
Has anyone encountered this issue or is it likely to be a driver problem?