July 04, 2012, 12:20:41 pm
Lumion FREE 2.5 has different (and in some ways fewer) restrictions than Lumion FREE 2.1, in terms of materials and models. You can even unlock more models by sending emails about Lumion to your friends/colleagues:http://lumion3d.com/lumion-update/
We have however moved the watermark/Lumion logo away from the corner, so that people who break the rules by cropping their videos to avoid displaying the logo will have less usable space.
If people continue to abuse the Lumion FREE
rules we will probably have to tighten the restrictions even more, e.g. with a full screen watermark. There's more information in this thread:http://lumion3d.com/forum/general-discussion/first-lumion-animation-how-to-hd/msg31890/#msg31890
Regarding the dark frames, I have only seen 1 other report on dark frame glitches from a beta user in recent months. It only seemed to occur in a particularly complex scene, and he hasn't reported any problems since then. However, since you can't save the scene I am unable to investigate your report in more detail.
My advice would be to recreate the scene in Lumion FREE
2.5 and try to render it again.
If you're still getting the dark frame glitches, please upload the 2.5 scene, and I'll try to reproduce it.