libraries not displaying and books folder/library not appearing and pdf not working

[WWWesten]

the players on 4 different types of devices and operating systems are all different and some work while others don't.. should be the same across all platforms i would think...

That would be great, but it's not really true. You'll have to come to terms with it. There are many reasons why clients are so diverse, and we could discuss them at length. The most important are technical and conceptual, plus historical factors. Simply try to reduce the number of operating systems in the future, getting rid of proprietary ones. The most flexible and similar ones are built on Android, while those that play video on their own screens use a specialized version of Android TV (now a thing of the past) or the newest ones use Google TV (simply the next step on Android TV). The principle is this: if you have a large and expensive gadget, then you should build an ecosystem of devices around it, or if most of your existing gadgets are members of a single family, there's no need to add devices from other families.