Does it use punkbuster ? .
I believe there was an issue where punkbuster and the fxgen clashed.....
Not sure of the current situation on that though.
Also you could try turning off UAC (User Account Control) if you have it enabled.
To disable UAC,
- open the contol panel
- choose "User Accounts"
- choose your user account
- click on "Turn User Account Control on or off"
- deselect the "Use User Account Control on the bottom
- start LOTRO
Turning this off has been reported to help other online games in relation to amBX lighting.
Win7Pro 64, I5.760@ 4ghz, P55-e pro,DDR3 4 gig, 2xGTX460sli, X-Fi Fatality Pro, 2xV/raptor 300gig Raid 0, WD 750 & 500 gig,Tagan 900W, MX Performance Mouse, 24" TFT , Antec 1200 Case, Eclipse III KB,Megaworks THX 5.1, LG Blu-Ray , 3 amBX kits