Have been having a few problems with the forum over the last few weeks. If you log in and view a topic in a sub forum then use the "Home" button it appears that you are automatically logged out of the site, all sub forums are denied access. If you then login again, your username appears in the title bar but all sub forums remain denied access and can not be viewed. You can login and out as many times as you like but access is still denied. If you log out, navigate away from the forum to another web site and then return to the forum it immediately shows that you are already logged in and all sub forums are once again accessible. I have tried clearing caches and history but this behaviour is consistent and occurs with Safari browser on three different devices, iMac, iPad and Macbook Pro so it is not a problem with a single computer but is occurring with Safari browser on all three devices. As far as I know there have not been any Apple updates to Safari in the last month that might explain this problem and it is not occurring with any of the other websites I use regularly from Apple based computers. This behaviour also occurs with Chrome browser on Apple platforms. I do not know if this happens with a Windows PC at this time but may be able to test from my observatory Windows machine later this week (it is currently down for maintenance). William.