How can I prevent a tap from zooming?

[HALBURN]

This is driving us nuts. When users tap on buttons in our interface the app keeps zooming in. Is there any way to lock this?

[Vaughan]

Check that the layout is the correct size: it may be too big so FMG is displaying it reduced (just a couple of pixels are enough). When it receives a tap it switches back to actual size.

If the layout is viewed as a list the maximum width is reduced a couple of pixels. This has caught me.