I'm currently using Orcad Layout Plus 9.20 and Windows XP Professional but my USB mouse scroll function doesn't wirk with Orcad.
It works with other programs.
I use the standard Microsoft drivers but because it's a Microsoft Intellimouse 1.1A Optical USB PS2 Compatible, it makes no difference if you use the Microsoft mouse drivers or the Windows drivers, they're both Microsoft.
In all other applications, the scroll wheel works fine. Strange!