Thanks for looking at it Rodney.

I've been uninstalling modules going backwards to see if I can get it working again. I tried messing with manageusers.ascx according to a forum post I saw, but only caused more errors so I undid the changes.. then all of a sudden it began to work again, but again only for the host portal.... and then after a while and removing another couple of modules it stopped working again.

The most depressing thing I found is that the only other post about this exact error was actually from me back in March with a previous version of DNN: http://www.dotnetnuke.com/Community/ForumsDotNetNuke/tabid/795/forumid/108/threadid/58803/scope/posts/Default.aspx

This is the sort of thing that really puts me off using DNN.

Rob

Thanks for the reply ecktwo,

I'm reallly getting desperate.. I've even gone so far as to try deleting dll's going back weeks, but to no avail. The profile/add user page loads fine on the host, but not on the other portals. I'm back to uninstalling modules going backwards, but I'm beginning to suspect something else must be causing this. The site was a fresh 4.34 install upgraded to 4.35 then 4.36 and I've also now upgraded a copy of it to 4.37 just in case it would fix it.. but noop.

I've checked now for those DNN 3 dll's but they aren't present.

I've got 8 portals on the instance and if I have to rebuild again from scratch I'm going to lose a lot of stuff like Active Forums posts. So I'm treating this as if I had 100 portals on the instance.. what would I do then? There must be a way to fix this.

Any further clues for tracing this down are greatly appreciated.