If you are having problems with Video Copilot stuff that your purchased I suggest that you contact them first. It's hard for us to say what could be going on unless we happened to have purchased the same model. It's probably a setting in Element 3D that you are missing.
More details of your workflow and screenshots would help. It would also be helpful to know if you have had success with other models from Video Copilot. There are just too many options to even make an educated guess.
Thank you for your reply! I just checked the comp settings and the resolution was set to "third". I solved the problem, but if anyone else finds similar problem, just set comp resolution to "full".
The most practical solution is to set your comp panel resolution to auto. This will give you pixel for pixel previews at your magnification factor.