I'm getting odd selection bugs in Mathematica (starting in 10.0.1.0, OS X 10.10 and still present in 10.3.1.0, OS X 10.11.2) that are making it impossible to use. For example if I simply click before the 'i' in
With I get
while if I click after the 't' I get
and if I click after the '=' in
mp = I get
Attempts to drag out a selection produce similarly bizzare results, with the selection extending several to many characters ahead of the dragged location, in starts and fits; while double-clicking selects huge blocks of code.
This happens in fresh notebooks in fresh Mathematica sessions into which any amount of code has been pasted or typed. Obviously this makes it impossible to get anything done. Has anyone else seen this bug? Is there something I could reset or disable that might be the cause?