In harvest festival 0.6, I have experienced a problem where building stop being recognized after leaving my world. Before leaving the world, I saw Yulif offering the building options I expected (including the mining hill and cafe). Additionally, I am prevented from putting the same buildings in the local area, as I believe I should be. However, after restarting, Yulif offers only the general store and poultry/animal farm, and if I spawn in the autobuilder items, I can build near the old shops. Replacing the shops using the autobuilders temporarily fixes it, but it is lost again after the world is reset. I am playing the Farming Valley modpack, but with Minecraft Comes Alive added and Harvest Festival updated to 0.6. Any ideas what could be causing this?

Also: Log files do not mention Harvest Festival except for a missing mcmod.info file and the timing data.

Was this previously a 0.5 world, if so try deleting the hf-data file in your save. If so, what version of 0.6, cause thought I fixed it.

If it wasn't an upgraded world, I'm clueless.

Yes it was an upgraded world, and that appears to have fixed it. Thanks for helping me, and thanks for this incredible mod!