It still happens with tidal heating off and in the earth bombardment sim and colliding with timestep at around 10sec/sec.
Edit: With both tidal heating and tidal evolution off, it seems fine.
Just tried turning on tidal evolution while some impacts were going on and BAM, it instantly froze and the planet disappeared.
Huh, with tidal heating on, it works fine.
And I'm also getting it when I run the earth solar system (create tab) at the default speed with tidal evolution on.
I'm also noticing that turning tidal evolution forces all of the orbits to display, not sure if that in itself is a bug or not.