I see you got miserable users hack installed. Could it be that these users are in the mis. users list (or someone who happens to have visited your site from the same IP)?
no, i dont believe so. Because miserable is set to the default settings and once tested on myself caused such pain and suffering that i couldnt go on. LOL
Theres a few people (maybe 5 out of 3500) in the miserable grouping. And even one of our admins is having an issue. I myself am having none at all.
The site issues started coming before miserable was even installed as well, but i assumed it was client side for the few members that complained. Then the 1 admin started getting it as well