I have not been able to run TerraCustom since May 16th at least. To try and solve the issue, I've uninstalled, wiped the folders manually, cleared the download cache, and reinstalled both Terraria and tModLoader from steam.
If I run TerraCustom from the Terraria Folder, it complains about "House_Banner_0.xnb", etc missing.
If I run it from the tModLoader folder, it complains about "TileCracks.xnb, etc missing.
I think this should be added to this issue tracker on github if it has not been already, but let me know if I'm wrong. Thanks.