I sometimes jump from inside Vim to use other shell tools and jump back in. On occasion, when I jump back to Vim like this I find that some elements of the Vim screen are blank.
The screen of Vim can be refreshed or redrawn by pressing
Ctrl+l. If that does not work, use the command
:redraw. If even that does not work, try
Tried with: Vim 7.4 and Ubuntu 14.04