I have seen an issue with two different clients where we are unable to export tiffs at all. The progress bar gets stuck at 0% and takes a very long time to move. These are anything from a single page document to a hundred page document. I can export text and pdf with no issues. This has occured on both versions 9.2.1 and 8.3 so far. I cannot reproduce the issue on my machine. There have been no apparent changes to the computer or servers they the clients know of. If I import a tiff in I can export it at that point but the documents that were already there have the issue.