Comment 17 for bug 238572

We don't know what it's specific to, only that somewhere in that stack it's going wrong. Could be Zope3, could be the mod_python Apache component, we're not sure.

Strange that you're still getting errors. On the PC I used it fixed the problem immediately, without restarting anything. I see that I also turned off the Adobe Reader (Internet) preference for "Allow speculative downloading In the background".