I have the same issue on more than one computer with AMD R5 240 gpus. (didn't have any problem with intel 4600 built in or with amd 5850) It happened when minecraft was just upgraded to the latest. For a temporary fix for me I was able to roll back my gpu driver and minecraft started working. (I have not upgraded my gpu driver recently it was the minecraft update that initiated this and needs to be fixed)
steve kuenzi
I have the same issue on more than one computer with AMD R5 240 gpus. (didn't have any problem with intel 4600 built in or with amd 5850) It happened when minecraft was just upgraded to the latest. For a temporary fix for me I was able to roll back my gpu driver and minecraft started working. (I have not upgraded my gpu driver recently it was the minecraft update that initiated this and needs to be fixed)