Thank you for your post.
Although I do not have an iPad with 3g connection, another user reported that if you boot up the iPad and immediately launch FileMaker Go, you will be unable to connect to a FileMaker hosted file. However, if you first launch Safari to initiate the 3g connection, then the next time you launch FileMaker Go, you will be able to connect. Please let me know if you can confirm.
It works! Even when the ipad has been on with no connection runing for a period of time you still cannot connect unless first activation the 3g connection via Safari or other.
This is happening on 2 particular ipads out of 5 in particular and I cannot see any difference in the wi-fi or cellular network settings beteween them. Oh well they work now which is good. Im sure you guys will fix the issue in future releases! :)
Thanks for your help.