Thank you for your post.
FileMaker Go runs on one of our Support Technician's iPhone 3g with iOS 4 without a problem. Since you have already reinstalled the app from iTunes, I would suggest rebooting your iPhone and reinstall iOS 4.0. Then, reinstall FileMaker Go again.
Please keep me updated with any progress.
Sorry i didnt Post before. I was working until late last night, trying to make it work. For some reason V1.0.2 would not start on my Iphone 3G 4.0. I rebooted like 100 times, loaded some files, created new files, etc, (From FM Pro and sync to iphone), but no luck.
Since i work a lot with this tool, i decided to update to FMGO v1.0.3, the latest version, and it worked!!!
Probably some incompatibility issue with Iphone 3G 4.0 FMGO v1.0.2, i really donty know, but im glad it works now.
By the way thanks for your response.