September 28, 2016, 08:07:01 pm
It might have worked once but trying to run Lumion on a PC with a graphics card that does not meet the minimum requirements is certain to cause crashes, glitches and other unexpected behaviour.
We see this problem quite often here on the forum; people ignore the warning messages after the benchmark has run, work on their scenes and when they start rendering videos they encounter all sorts of problems.
In summary, the only way forward is unfortunately to run Lumion on a PC that meets or exceeds the minimum requirements.
On laptop PCs, this means a GTX 970M or better.