I had the same problem. Then when I did get it working again, I couldn't search online for codes. I figured it was because Gameshark.com sold to Madcatz and the site was down.
So I downloaded the X-Port software, same as Sharkport but for AR2, and everything works fine. It searches for codes at codejunkies.com
BTW - I'm using XP
PS2: SCPH-30001 v4 | Crystal Chip CC2.0 SLE | HDLoader v0.8c | 80GB HDD
PSP: PSP-2001 Silver | CFW 5.00 M33-4 | Sony Memory Stick PRO Duo 2GB
Xbox: v1.0 Thompson Drive | UnleashX v0.39.0528A | 80GB HDD
Wii: Black | WiiFlow v2.2 | 320GB USB HDD