I updated the arduino software and after that i noticed that the arduino is not detected on my pc. So nothing in devide manager and no sound or anything when i stick in the usb, tried all usb slots.
I also got my laptop, installed the newest arduino software and also nothing.
The arduino does get power through the usb and works perfectly with everything connected to it (display, leds, temp sensor and relay). Its just that i cannot upload my modified sketch anymore now
Also good to know is that i placed a (original) R3 proto shield on the arduino and after connecting all the wires exactly the same as it was on the arduino, it went crazy, temp sensor showed crazy values and all external leds went on. This i did around same time i updated the software.