Here's some odd behaviour with the text fields in the properties window:

1. Click on the right of the text of any field.
2. The cursor is correctly placed to the right of the last character
3. Click and hold the left mouse button
4. Move mouse to the right
5. NOTE that a highlight appears (reverse colour, looks like it's highlighting a space character)

Bruno

It's a rich-text edit control. Any mouse-handling oddity is Microsoft's fault.