does anyone trade etf's

[breadman]

does anyone trade etf's here.
the one i am most interested in is (isf) ishares ftse 100. the ftse 100 is more or less unchanged today but the ishares ftse 100 etf is down by 1% which means the ftse 100 should be 50 to 60 points down today. does anyone know if these types of moves happen often. this is one of the most liquid etf's so you would think this would not happen.

thanks,

breadman

 

[breadman]

it's ok, found out the answer is that the etf went ex-dividend today.