Saves from 0.5 don't work in 0.5, either. I'm running into errors caused by not being able to roll back.
I think the problem is that you have 7,000 lines between labels and a maximum rollback buffer of the default, which I think is only 40 lines. You need to A. increase that and B. keep the distance between labels shorter than the limit or loads won't work.
Specifically, anything within that limit will always roll back to the previous label instead of starting at the load point, and anything outside that limit will throw an exception.
So basically, crank up the rollback limit to several hundred, and then add a label every couple of hundred lines at natural scene breaks, and these problems should go away.