Can't preview imported movie file in node setup (example file added)

How can I preview the live sequence imported with nodes when running the timeline (alt-a, UV/Image Editor)? Just a single still frame appears: It seems to display the actual frame only when play foreward is arrested.

In the zip file link (node_04.blend, please note: this might sound quite common sense-ish, but please press ctrl-tab to update view;-))

In the file I display dual vindows with both node input and movie strip where only the latter seems to animate.

Have I missed something?

Kind regards, Mikael

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