So then it hit me (note: this refers to European controllers, the ones with the colourful buttons): I even got another controller from a friend (note: all original snes controllers, both ports of the adapter work with the good one) but to no avail, same problem. you name it, I tried every possibility that I could in order to figure out the flaw. Tried various emulators, switched the controller-ports, did key-mapping with the functioning controller, then restarted the emulator with the controller that didnt't work. The same that has been described above happened to me: One controller works fine, on the other one only the B button works. As I want to have the right feel to the gaming, I got my old SNES controllers, a Mayflash adapter and started up my system. Recently I have been setting up my RasperryPi after already having used various emulators for many years. Hey all, first post, felt like sharing my experience on this.