Hi all, I have just unticked 'Include font style with Copy' under:
>Tools >Preferences >Fonts >Editor
and it has worked for me with the below. I do not have to close Outlook.
PL/SQL Developer
Version 10.0.5.1710
01.92698 - 1 user license
Windows 7 6.1 Build 7601 (Service Pack 1)...