I use bad camera.
Sometimes , especially after start, for a few seconds the click with middle mouse button does not rotate the camera.
Today I could not do this neither in Ender nor vanilla clients for a longer time.
After a few restarts it started working on Ender (did not check in vanilla since I do not use it in general) at first around 70% of tries. After 2-3 minutes works okay.
Does this happens to anybody else or it might be just a sign to change my mouse?
Is there any other way to rotate camera than middle button?