Hadn't seen an update on this, so I thought I'd dig into it. I've been looking through the JSON. The DB only loads 225 sets, (assuming it reports the last set it loaded) the problem is somewhere in the Kaladesh Inventions block. Haven't had time to compare differences in the new file with the old. But plan to write a little script to spit out differences between the files. I've got a lot of new cards I need to add and I can't do it until I get Zendikar in the DB
I'll let you know if I find anything more. I haven't read through the JSON loading code for the DB either. Hopefully something will make itself known easy enough without that.
Edit: Got a python script setup to edit the JSON. It is not the Kaladesh portion like I thought. I'll keep playing with it this week and see. It must be something in the new set throwing it off. Guess I'll just start cutting pieces until I figure it out.
Edit Edit: Tried to post this last night but it didn't save. The problem is with the Zendikar Rising Minigames section. MZNR. I haven't been able to match it down to a single issue yet. I've tried replacing the text incase it was too long. That didn't help. So there's something else in there mtgdb.gui doesn't like.
Here's a working Zendikar Rising File, I just have that problem section removed currently. You'll have to update from mtgjson and then replace the broken AllPrintings.json in the data folder with this one. (My account is too new to put links to downloads, asked a mod if they could post it)