The issue is that both plugins are overriding the WordPress’ “send_to_editor” JavaScript function. For one reason or another CFT’s override was overriding Simple Field’s override (if that makes any sense).
Anyways, turns out CFT doesn’t actually use the media selector. It seems as if they intended to one day use it as the only place it’s being called is commented-out.
SOLUTION:
Get rid of CFT’s override.
Now we can all get along!
@pär: Thank you for your response anyways.
