Have You tried to restart the iPad and/or the quit FMGo (double tap the home button, then wipe off FMGo)?
Just performed a complete reset of iPad and also a double tap and quit FMGo.
But still not working...
OK.. there are issues with an iOS device running for a longer time
You don't have a 'commit...' step after the 'setField..' - but the script above is after the user entered his/her data? Commit? Is the iPad connected to the pc or is the DB local?
Commit added, but not solved.
Opening via host, database is on the network host.
You really should get pretty much identical behavior whether using an iPad with GO or a Computer with Pro. There's some detail here that's at fault that's not obvious from your posts. Are you perhaps using two different sets of layouts, one for Pro users and one for GO?
As a test (not a work around), try using the same script on the same set of layouts for both Mac and iOS devices.
Note also that you appear to be using the standard scripted find method similar to the examples found here: Scripted Find Examples
And as noted in that thread, the fields you are referencing in the "calculated result" parameter of the set field steps should have global storage specified--but that is something that would keep this from working on both devices.