June 28, 2012, 01:14:27 pm
As Peter already said, a few screenshots might help us diagnose the problem.
1) Which version of Lumion are you using? (Check in Settings) If you're using an older version, please install Lumion 2.5 and let us know if the glitch is still there.
2) Are you using a recent Nvidia graphics card driver? Please run "DXdiag" in the Windows Start menu -> Click on "Save All Information", and attach the dxdiag.txt document to your next post (Click on "+ Additional Options" below the text field).
3) Are the scenes with the reflection glitch particularly complex?
4) Does the reflection glitch also appear on final renderings?