TPlanet

I've downloaded the TPlanet full programme from www.fourmilab.ch and whilst
I think it's not bad, it has a bug which causes the programme to crash. The
crash is repeatable and quite consistant so it should be fairly
straightforward to cure but I have no idea how to report the software
problem. The programme also crashes when the animation time intervals are
more than a minute and I dare say they are caused by the same problem.

Just in case someone knows the problem is :-

Run the programme in animation, medium speed (to save time) and set the
universal time to (say) 07:00 hours and look at the "Sky". When the UTC is
07:50 the programme stops and the only thing to do is control, alt. del. to
finish and return to Windows. The Tplanet Lite programme is exactly the
same of course. Just a couple of times when playing around with the
programme setting up parameters, the crash happened at 07:46 but I cannot
remember how I made it happen!!

Does anybody know of a similar but non crashing type of free programme?

Gazy