Crystal Report Viewer shows blank but exporting shows results

I'm getting a really strange issue when opening a report using the CrystalReportViewer class. The Crystal Report Viewer shows up nicely in my webpage....but the report is completely blank. When I click on the Export button in the Viewer & export to any format, the results show up nicely. Also when I right click on the Viewer page & view source, I can see all my report data there in Javascript....but for some reason it's just not being rendered on the page.

I'm using Crystal Reports 2008 & I believe I've added the necessary jars & also included the entire crystalreportviewers folder (with all js files) in my Web folder. Also, I don't see any exceptions in the crystal_exception_log_file.

Any help would be greatly appreciated