**System Information**
Ubuntu Linux 14.04 kernel 3.16.
**Blender Version**
Broken: 2.73a (bbf09d9) and 2.74 (000dfc0)
**Short description of error**
Typing "[" in the Python console disables backspace
**Exact steps for others to reproduce the error**
1. Open the Python Console
2. Type "ab[cd" in the console. Note the "[" in the middle.
3. Press backspace to erase the text.
4. Nothing happens (backspace does not seem to work, but more text can be written)
Typing just "abcd" keeps the backspace working.
Happens almost every time. If not try again.
If blender loses and regains focus backspace function is restored.