The problem is with the special hatch order that can be set via the Window Ordering menu in the editor: You have set a custom hatch ordering of "0-1-2-1" (as the respective index of the hatch). Somehow the experimental version cannot properly read this and only understands that you want a cycle of length 4 for the hatches. So it looks for a fourth hatch, instead of recognizing the hatch with index 1 as the fourth hatch, resulting in an infinite loop
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So for now the way to deal with this problem is: If you want a hatch cycle of length n, then add hatches, so that there are n of it. To be sure, change as well the hatch odering in the Window Ordering menu to index "0-1-2-...-(n-1)". Then it should load in the experimental version as well.
Attached a version of "Deep Freeze" with the fixes I described above.
PS: I took the liberty to change the thread title to something more descriptive, now that the reason for the bug is known.