I know this post is old but I just installed the antigardenlag last night and I'm having the same problem.
http://img.photobucket.com/albums/v720/short2cake/New%20pics/snapshot_14dc768d_b5211438.jpgMost of the garden was ready to be harvested before I installed the hack. After installing and going to this lot I saw everything was gone. I get a status report of "sickly". I decided not to do anything at first to see if they would start growing again but they didn't. I can compost, water and even tend when they get weeds but they never grow or produce any fruit/veggies.
I took the hack out and went back into the lot and it still looked like that. I ended up composting all of it and starting over...it's growing fine now but I've not put the hack back in.
I don't have any other hacks that have anything to do with gardens/gardening and the HCDU doesn't show any conflicts with anything else that I do have.