If your game isn't showing your content, even though you made code changes and there are no errors or game crashes, there may be an issue where Eclipse is failing to build your workspace. You can confirm this by going to the "Problems" tab in Eclipse. It should be grouped with the Console, where text will appear when you are running your game. It may be either at the bottom of the Eclipse window or on the right side:
Your Problems tab may show three errors indicating that Eclipse is having trouble building the project. Your MDKExample folder may also have an error icon:
Here's how to fix it.
Right-click on MDKExample. Move to the Build Path menu, then click Configure Build Path.
In the new window that pops up, click on MDKExample/src/main/java. Then click Remove. Do the same for MDKExample/src/main/resources. Click Apply.
Make sure that you do click Apply, otherwise the changes won't work. Next, click Add Folder. Click the dropdown arrows next to MDKExample, src, and main to get to "java" and "resources". Click the box next to those two folders. Click OK. When it returns to the window above, click Apply, and click OK.
The issue should be fixed now and the errors should disappear. Run Minecraft to see if your project has been built correctly. If not, contact CodaKid Support using the chat menu in the lower-right corner or at email@example.com to get assistance with the issue.