I installed the recent 1.19 client and while building a skybox, I kept feeling something was wrong until I realised that while in mouse look (first person view) I could only fly downwards but no longer upwards! Is this a bug in the new client? I don't like having to press Page Up constantly!
EDIT: apparantly it was caused by a bugged item I was wearing that lets me fly higher - I hadn't detached it since I changed clients.