Since the release of iOS 7, we have seen an increase of reports, particularly on older devices (iPad 1 and iPad 2) where Knots 3D (v3.3.x) gets into a bad state.  Reports show this happening occasionally on the Language Selection screen.  We think we have isolated the problem and a fix will be available in the next release due out within the next few weeks.  In the meantime, the following instructions should resolve this and similar issues should they occur:

“Kill” the app and restart it, the problem will go away and most likely you won’t ever see it again.

If you are unsure how to “kill” an app, it is as follows:

iOS6:
– Press the physical home button once to exit Knots 3D
– Press the physical home button twice to see a list (across the bottom of the screen) of apps in memory
– Hold your finger down on the Knots 3D icon until it starts to “jump”
– Press the “-” sign.  This stops the app from running (removes it from memory but does not remove it from your device).  You might want to stop other apps you are no longer using while you are at it.
– Restart Knots 3D in the usual way

iOS7:
– Press the physical home button once to exit Knots 3D
– Press the physical home button twice to see thumbnail views of apps in memory
– “Flick” (swipe up) the Knots 3D view up with your finger to remove it from memory (This stops the app from running e.g. removes it from memory but does not remove it from your device.  You might want to stop other apps you are no longer using at the moment while you are at it.)
– Restart Knots 3D in the usual way

Android:

Follow the instructions on this site:  How To Geek: How to force kill android applications without a task manager

Please contact us if this does not resolve the problem.