You have to save the content packages in the content folder. Otherwise UDK won't find them next time you start it and says that you're referencing to external content (external as in out of the content folder). You can open external packages by clicking the "open external package" in the content browser. It's in the lower…
Weird. If you keep your package inside the Contents folder, when you open a new map it automatically loads parts of the package that are being used in the scene. All you need to do is fully load it if you wanna check everything inside said package, including elements not in the scene. As Unstoppablex said, this is just if…
Ok, I'm confused. I'm relatively new to UDK and have yet (I think) to get my packages/map combos right. Take for instance the env I'm working on now; I created a package and saved it as Contents/Lab_Packages/Lab_Assets. I then saved the map as Maps/Lab/Lab. Low and behold, I now have a package within my Lab Map directory…