Thank you all very much, crisis averted!
For anyone curious or interested or in case you are an idiot just like me:
I have 4 shares, Movies, Tv, Other and rootshare. And yes rootshare is exactly what you think it is, a network share where i can move the other shares completely and freely around. What did I do this morning? I got some new files, copied them via samba directly into movies, after that I accessed rootshare to move the 2 files meant for TV into the TV directory, more specifically into the subfolder "G" in TV. Well at least thats what I wanted to do, instead I marked the Movie share in rootshare and cut and copied into "G", and thats where plex suddenly broke down and stopped working, and shortly after opened this ticket. So after Squids post I looked frantically, found the share and moved it back (this time using krusader lol) into the rootshare. I guess running system diagnostics and disk diagnostics won't do any harm so I'll get on to that soon, but I just tested some files randomly on the share and it looks fine and the files are working. Thanks again guys, you saved my weekend!