Eventually the Long Description field can be grayed out in all applications while using Maximo in Internet Explorer.
Turn on the Compatibility View in Internet Explorer following the steps below:
1. Open Internet Explorer.
2. Go to Tools > Compatibility View Settings.
3. From Compatibility View Settings dialog:
3.1. Enter the Maximo URL in the Add This Website field.
3.2. Click on Add.
3.3. Click on Close.