frankie is getting a similar problem in maya 2008, although i don't know if it's tied to the selection method - whenever he selects something it takes 2-3 seconds to actually select it (with just the channel box/layer editor on the right, not the attribute editor).
having the attribute editor open is a surefire way of slowing down everything though... you can see it building up the panel as you select stuff...
try putting "MAYA_NO_VERTEX_ARRAY_SELECT = 1" in your maya.env file in my documents\maya\8.5 might have to create it, and i'm pretty sure doing that helped me with selection issues.
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having the attribute editor open is a surefire way of slowing down everything though... you can see it building up the panel as you select stuff...
try updating 'or' rolling back your video drivers, and see if that helps ?
EDIT : -
Came across this little snippet on cgtalk too with regards to the same problem : -
'Do you have two monitors? Then they must be set as wide instead of dual.'
edit: shit its still happening again