Okay, doing as you asked, though implied by my exhaustive efforts that I've covered them, I will reply to each line in case I missed something:
(edit: There were a couple things I hadn't tried, but the end result didn't change)
Was running 1.3.1 when I posted, NOW running 1.4, made no difference, fwiw.
Read faq (awhile ago)
searched the forums
read through anything similar, which I didn't find much of, more related to other issues I had earlier..
1. CB login module IS publiashed and the stock Joomla mod_login is disabled
2. CB's registration independent of Joomla's.. Got me on that one, when the user clicks on the cb_login boxes registration button, it brings up the CB registration, so yeah, I'm pretty sure it is.. It was installed per the guide/docs, and before upgrades awhile back everything worked fine.
3. PHP Version 5.2.14, so yeah, well within safe limits..
4. CB and Joomla are up to date.
5. Yes, default is enabled (in fact, all plugins are enabled cept geocoder)
6. Yup, using the default, in fact..
7. disabled all but the core etc, that it wouldn't let me disable.. no change.
8. same effect as 7, no change.
9. same effect as 7, no change
10. yes, as indicated in my 1st post.
11. fresh install as in brand new, or just new 'install files'? Like, set up a new installation but yse the existing sql data? Or like, create an entire new instance?
12. memory limit isi fine, far as I know.. Installed the 1.4 (and all other) updates just fine.
13. like memory, far as I know.. what is deemed as 'high enough'?
14. All green.
15. well, no, but yes, sort of (if you're driving at have you recently reinstalled to ensure no corrupt files) I did just install 1.4.0 today, made no change.
16. I don't use cache (too many live/current) needed things on my main page, but I flushed it nonetheless..
17. yup, also used various PC's and various browsers..
18. host not caching.
19. sef not in use.
1. 5.2.14
2. 1.4.0
3. 1.5.22
4. See original post up top
5. None and n/a (doesn't apply to the mails being sent to me)
6. no host errors being logged (it's enabled, just not showing anything out of the ordinary. Even asked techs' to take a peek, since they offer Joomla sites and support, though mine was not installed through them, they too were unable to locate the oddity).
7. None.
8. No sef.
9. configuration.php file is fine
10. It is an upgrade. stated with 1.0, went to 1.1, at 1.2.x the problem appeared, I posted briefly on it, never found a solution (also had the always displays page 1 on users no matter what page you click on, back at that time, found a solution to that). With the advent of 1.3.x, I decided to post and try again to solve this, and well now here we are rapidly on 1.4, which is where I am now.
11. Always have run Joomla 1.5, followed religiously with the security updates. Considering jumping eventually to 1.6 but want to lick this issue and leave it behind before I do (will never know how when every popular CMS that existed with Joomla was born why they chose NOT to include security levels/access levels, whatever you want to call it)..
12. All. Firefox 3x, IE 8.x, Chrome, Android's brower, iPad's browser, iPaq's browser and minimo...