When a statusbar item contains Unicode, it seems to throw off the character-length calculations, and “wipes out” later characters in the statusbar. Here’s a picture: http://ell.io/KncM
The Unicode character in that timestamp format will misalign the “prompt” status bar such that text that you type ‘jumps around.’ (Depending on your theme, if there is text *around* that statusbar item, you may need to remove it. Try replacing <code><tt>time = "{sb $Z}";</tt></code> in your config file with <code><tt>time = "$Z";</tt></code> temporarily.)
When a statusbar item contains Unicode, it seems to throw off the character-length calculations, and “wipes out” later characters in the statusbar. Here’s a picture: http://ell.io/KncM
It’s fairly easy to reproduce. Try the following: