Open the thread_list in its own window/tab and press Ctrl-F5
If you do that both before and after pressing 'Go' it might help.
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Force refreshing (Ctrl+F5) just the thread list seems to have done the job, but only when I force refresh it.
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The thread list seems to be working okay now, but start page still hasn't updated since 21:04 last night.
It's up to date here, so you probably need to force-refresh the pages (as per Pete's instructions) to get it work correctly.
That works initially, but as soon as I next select "Go!" in the thread pane, it reverts back to the old thread list from earlier this afternoon.