Hi freename, well the main way that what you describe can happen is from running a cracked version. I don't know of any way that it could happen with the trial version. So make sure you're getting the real trial version from http://moi3d.com/download.htm and not from somewhere else.
There is an educational discount version which you can order from Studica here: http://studica.com/moi3d
- Michael
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