I'm seeing the same thing. In our setup we have an EventSource object hooked up to an SSE stream.
Calling window.print does nothing until we break the SSE connection. Only then will the print window appear. When we let the page fall back to old school frequent polling (ie no SSE connection) window.print works as expected.
Chrome version 27.0.1453.110
Any hints on this would be greatly appreciated as our temporary fix will not be elegant (disconnect SSE stream, do the printing, refresh entire page).
/Lars Ole Simonsen