If I have run a long line in IPython, and try and recall it (using the up-arrow) or backspace beyond the start of the current line, it displays incorrectly (all smushed into one line)
For example, in the following session I wrote a long line [1], entered a somewhat-blank line [2], then up-arrowed twice to get the print statement on line [3], and the following happened:
Happens in both iTerm and Terminal.app.. I had a similar problem with regular terminal sessions, which was fixed by properly terminating colour codes, but I’m not sure how to fix it with IPython
Aha! I had an old version of the Python readline module – installing the latest from http://ipython.scipy.org/dist/ and it works perfectly!