Preview report drastically different than export or deployed

I have been noticing this for a while now and wanted to see if I could bring it to Microsoft's attention. On a lot of my reports, the preview looks one way, then when the report is deployed and run or exported, it looks different. And not just a few aesthetics, but lines, columns, colors, etc. I have spent numerous hours trying to fix a problem in the preview that never existed in the export or deployed version.

Does anyone have this issue? Is Microsoft aware of this issue?

What format are you trying to export to?

The "preview" in Visual Studio uses a different output format than the HTML displayed in the web control, so you may see some differences there.

Different renderers have different characteristics regarding pagination and capabilities; some differences are expected. If you supply some more details about exactly what problems your experiencing we may be able to give you some specific guidance.