Well, it does seem a bit crazy, yes
Is this only video? In that case it might be a video driver issue. Can you play audio successfully?
You should log in to the web admin and check "Media File Sync" and see if your files have been detected by lmce, only then will they show up in the media browser.
You should also read up on how to add additional disks(if you have your media on external/other drives than the main lmce drive), as lmce works best if you put your media into LMCE's directory structure.