Vim - Weird Behaviour

Question

I just recently deleted my .vimrc, and since I've added a few things back in and added some plugins I get this weird behaviour.

1. I click 'i' to place me in insert mode.
2. I type a character (any character)
3. Suddenly I get a newline break right where I started typing.

Extremely annoying! :) Any ideas on what this might be?

Answer 1

Sanity check. What happens if you run as vim -C (compatibility mode, behave like plain vi) or vim -u NONE (don't load any initialization files or plugins)?