No, it is all browsers. For chrome you can find the print background colours next to the print button.
for ie9 it is much harder to enable. The user needs to know how to unhide the tool bar (alt-f) then go to page set up and tick the "print background colours and images"
As for the next button, i thought at first this was to view the next page (where page greater than 1) but no this is not the case. it appears to have no action. I took a look at the html and the button is "next_task_blocks_button", I assume this means the next pages worth of tasks (which does not work).
Andrew
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I forgot to mention why "print background colours and images" are disabled by default, this is because otherwise when you go to print huge blocks of colour would get printed. Not sure on the design descions here, but as far as I know you can't force the browser to print the background colours and images. (a security issue).
You can get around this though by adding a "printer friendly page", it seems in this case it's not so printer friendly.
One more (low priority) gripe is that the icon is not intuitive, a simple printer icon would have sufficed.