I think this is a screen resolution problem. When i switched to resolution 320480 then functionality of subpanel create button is not working.
But when is use resolution more than 491496, its working fine.
I’m having the same issue on an IPhone 6 using both Safari and Chrome (from app store)
The Create button works fine on the module but subpanel create on both default and custom modules bring up the loading sign but nothing happens and the create and edit buttons (on each record) disappear.
As we all use Iphones, I need to find a solution…any php files or instructions someone can point me to?