Below, you should be able to see three copies of the same sample image.
All of them should have a toolbar above them, with a printer icon on the far left. If you see an image but not the toolbar (and assuming you haven't modified AlternaTIFF's toolbar settings), then your web browser is probably using something other than AlternaTIFF to display the image (maybe QuickTime?).
If Test 1 works correctly, but not Test 2, and you're using Internet Explorer, try reactivating AlternaTIFF.
Test 1: Testing AlternaTIFF.
||Test 2: Testing your default TIFF viewer.|
Test 3: Testing framed and full-page support.