I have the most bizarre problem.
My Warp tool (Transform > Warp) is working backwards, the controls work on the opposite side - so if I drag a handle in one corner, it affects the diagonally opposite corner. It's making using the Warp tool impossible.
Any ideas with regards to fixing it?
Try resetting Photoshop preferences... Sounds like a glitch/bug...
To restore preferences quickly using a keyboard shortcut: Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop.