Almost every time I open Blockland v19 on my Mac, almost every time (with the exception of a few after I disable add-ons), about 2/3 of the way through loading datablocks, it will get stuck for a few seconds and crash.
Console seems to be saying that it is completely random. For instance:

Right in the middle of loading the sentry, it just stops, leaving "turr". I tried disabling the add-ons it crashes in, but it doesn't seem to be doing anything much.
I also noticed Butler had this problem, too. Kudos to whoever can find something to fix this.