Marek Jablonski

Step1: set server/computer to a fixed internal ip

step2: go into your router settings and set up port forwarding from port 19132 externally and 19032 internally to your server/computer's ip

Step3: go  into your router settings and set up port forwarding from port 19133 externally and 19033 internally to your server/computer's ip

Step4: go into server.properties and change "server-port" to 19032 and "server-portv6" to 19033

Step5: type "my ip" into chrome, and use that number along with the default server port to add the server to your list

This should fix your problem 

Do you have a screenshot of the files inside the world folder?

Still happens to me a lot on 1.0.8

Same thing happens to me for Pocket Edition 1.0.8 Logged in and out, restarted device, and tried different account with no luck.