By the way, don't panic too much about the whole patch thing.....I know that Halo's been working on it for a long time....so, here's how to salvage your maps:
1. Take the folder(s) of the .cfg files for the map(s) and put them......somewhere. Do the same with the map's .map file.
2. Delete everything in FeralHeart. (You don't have to do this, but when I tried it without doing this, I crashed.)
3. Download the game again.
4. Download the new patch. (The new patch is only availible for Windows, so sorry, Mac users. :/)
5. You should see that same map in the Map Maker. Re-export them and you should be fine. ;3