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As a language model AI, I do not have access to the specific details of your software or computer system. However, some common reasons why arrow keys may not be working in input or textarea fields include:

1. The Num Lock, Scroll Lock, or Caps Lock key is on, which can change the function of the arrow keys.

2. There may be a hardware issue with the keyboard, such as a faulty connection, broken key, or sticky key.

3. The software or application you are using may have disabled the arrow keys for specific input fields or may have a different key mapping.

4. Your computer may be running outdated or incompatible software or drivers that are causing the issue.

If you are facing this issue, you may try restarting your computer or checking your keyboard settings. Additionally, updating your software and drivers to their latest versions may also help resolve the problem.