Ghnuberath

I can also confirm this bug. I have a probe with 3x ion engines. It was working fine in kerbin orbit up to about 0.8km AP/PE and then suddenly no thrust in time warp despite fuel consumption. I was doing repeated burns to escape Kerbin SOI. I have definitely noticed this once with nuclear engines as well. On return from Duna I time warped a few intercept correction burns and ended up with vastly less fuel and unmodified trajectories and didn't know what had happened.