You need to update your binaries, the very first version of AS for 5.6 that I put out I reverted a workaround for a crash from 5.5 as it appeared fixed. It is in fact not fixed in 5.6, it just wasn’t showing in editor builds.
I later went and re-instated the work around but you must be on the binaries from the day before.
Edit Also this is the wrong forum thread, but its fine.