Has anyone noticed that rabbits are damn near impossible to catch anymore? The usual "get as close as possible then right-click" it approach is failing miserably, mostly because your character no longer auto-follows the rabbit but instead stops right where the rabbit used to be, as the hare runs away.
I think OP might not have the required 2x2 free space in his inventory.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."
Lol, don't feel bad, I'm sure most people have done that at some point too. I know I certainly have, and it confused the heck out of me until I realised what was wrong.