DonXoop wrote:
I'm a little confused by the term "Banning". Is it technicaly a temporary refusal to allow a login with a "wrong password" error? Also, what happens to a user already logged in when the problem happens? Are they kicked off or continue to function? Does the site function normally as an anonymous user during this time?

Given my understanding of the problem it doesn't sound like an evil crack of xoops. It could however be any of several things:
. AntiDos misconfig.
. Custom sessions.
. MySQL issues.
. Content accelerator (reverse proxy).

Too many things to try but easiest is to first:
. disable AntiDos (also have a look at any IPs listed as actually banned), don't use a cache for this module.
. Disable custom sessions. (are you using the "Remember Me" hack?)

sbkiller wrote:
Do you have anything in the styleMAC.css and styleNN.css?

If so just leave it and even it's blank inside. Nothing will bother the theme.

m0nty wrote:
i'd find it hard to believe that u were being hacked, altho i'm not saying u shud completely rule it out..

but due to the exact timing and the periods that u can't login would definitely suggest something on the server/hosts side..

it's a very rare occurence that a hacker would p*ss about, playing games like that for so long without either defacing the site or leaving a mark somewhere..

usually during backup of the sql database, some sites receive the error message: error in mysql, unable to connect to database.. not always the case tho as hosts and configurations vary..

sbkiller wrote:
The three CSS in your each theme folder are:

style.css
styleMAC.css (No need)
styleNN.css (No need)

All you do it's to use the style.css and the site will be compatible with every browsers on the any operation system.

Check out my site, I made myself a complex theme, it's hard to do it but it work on every browser I have tested. So general and basic theme will be working propertly on any browser unless you have some special css code which only compatible to a specific browser.