Thank you tilly. Since posting I have been persistently trying 'Newest Nodes' and enventually got through. After using the button to clear them, I have no problems.
When you mentioned this in chatter I checked and replied in chatter that you were trying to list all nodes since late January and that you should reset your "newest nodes" time via User Settings. I'm sorry you missed that.
Turnstep has quite a list of site suggestions summarized.