Looks like part of what is responsible for the errors is the way phpbb displays users avatars via a script instead of just loading up the image file. I've got loads of work on today so can't look into any addons which change this but meanwhile I've disabled avatar display for guests, to reduce server load. I may also try reducing the number of posts displayed per topic page as a stop gap while looking into server upgrades.
I shall also look at adding an avatar gallery took give users a selection of avatars to choose from if they don't have a picture of their own. Gallery avatars are displayed as normal images so won't cause a problem.
I shall also look at adding an avatar gallery took give users a selection of avatars to choose from if they don't have a picture of their own. Gallery avatars are displayed as normal images so won't cause a problem.