Merged.
Tbh, there are more of these 'ip ban' complaints coming into the admin than is reasonable. This thread can provide some of the history of what we've been trying to do to address it, with minimal success. What's really screwing it up is that it sounds like a vBulletin error message screen, but someone reported something similar on the Pillreports pages (they use a diff software, so it shouldn't be the same error, but they share a server, so there is a connection). We're still trying to address it.
The best we can do at this point is suggest people reset their IP as outlined in the thread. If you know your ISP, please tell us (it may be a common issue to an ISP, as many of the complaints are coming from the UK). Give us a screen capture of your error message, as it may help.