I realized I’d been working on a non-eBay project so hard I forgot to download the GS 10 beta. Just did so today.
All of a sudden my applescripts stopped working!
Spoiler: They all used tell application GarageSale to activate, and I carefully downloaded the beta as GarageSale 10 beta 6.
Anyway, I doubt anybody who uses a lot of scripts hasn’t already worked that out, but I thought I’d share just in case 
Rename the old one, and make the new one GarageSale if you want this to work.