We have had reports of flickering screens when attaching to some Minecraft PE servers.  

Following testing we found that if you add the server name using the IP address it resolves this problem.  

Steps you need to follow are:

Firstly, note down the name of the server your child connects to:

Open the app Minecraft PE, then click PLAY (you will see a list of servers similar to below)

In this example I want to connect to Lifeboat:sg3.lbsg.net:19132

Next you need to launch Network Utility, use the Lookup facility and type in the name of the server, and click Lookup and it will display the IP address. (see below):

If your not sure how to do this, just email in with the server name and we'll look it up for you.

Then all you need to do is re-create the server using the IP address:

If your not sure how to add a server, all you need to do is:

Open Minecraft PE, click PLAY, click NEW, then click "Create a world +" and in here you enter the server name, IP and Port number, then lastly click ADD SERVER: 

This should resolve the problem.