Sometimes if you used TOAD as your user interface to connect to Oracle Database, you might face this kind of problem :
Your arrow keys; Up and Down key, Left and Right keys, Backspace and some other keys doesn’t work in TOAD.

Toad Issue backspace key not working
Yea i know, its really annoying isn’t it? But no worries, with this simple steps, your issue will be solve.
1. Close your TOAD first
2. Go to your temp Quest Software directory, in my case, my TOAD temp directory is in here = > “C:\Program Files\Quest Software\TOAD\temps”
3. Find and delete the file “PLSQLKEYS.BIN”.
4. Just reopen your TOAD again and ta..ta.. your TOAD issue will be solved.
Note :
- Click the image to see more larger image on the TOAD temp folder location.