Be wary of using a Roku on television sets that have a picture tube. Older televisions that do not have HDMI connections require the use of component cables (red/yellow/white) in order to connect to Roku.
The Roku appears to change the color to magenta and no adjusting of the color settings can fix the problem.
It apparently is happening to some of the newer models as well.
If someone knows of a fix for this problem, please post it.
Thanks.