But I can't log in etc etc etc etc
As Ron says, the GUI has no idea how to log you in so that will just take you directly to the Registration page. There is no code in there other than links that would take you directly to any other page - unless you successfully Log On.
Can I please strongly suggest that you ask for help first on what the problem might be next time rather than hurl your toys out of the pram and scream and shout in public. If there is a problem for you that others apparently don't have, we can locate and fix it if possible.
In answer to your question, your uploads ceased with the last one being at 08:17 this morning - you might want to check the upload terminal details as the web site Log On data has no connection with the upload at all. One person recently changed their username inadvertantly but that causes loggable errors and there haven't been any from you. It was working for you so something apparently has to have changed and there have been no changes with the upload side code for some time now. Unless you have disabled it since posting of course.
As said before, if you have cookies that are not destroyed when you finish the session, close the browser or whatever, then you should NOT have to log on again for a long time if atall. And if you do you'll only need to enter your UserName and Password, again as I've said before - all providing you have permanent cookies. It sounds like you do not I'm afraid. But I could be wrong of course.
The captcha IS needed when
first logging on in my opinion - it is an easier server entry point than the Registration. I have also worked on programming including security for Government and other entities over the past 22 years and am very conscious of the need for it after servers have been compromised. It isn't primarily to protect the data as such, which as you say is not particularly sensitive. It's there to protect the server itself as you should well know if you have worked in security. When you have the ability to see tens of thousands of continuous root (and other account) automated login attempts caught and the IPs banned by cPHulk, it tends to bring the risk home.
The blanket statement
it is useless in its current form is untrue, it's your own opinion of your own experience. Since yesterday morning nine people have logged on at the first attempt and two have failed through invalid passwords but succeeded on 2nd attempt. Other people have mailed to say they have no problems.
As explained before at some length, please check that you are retaining Cookies permanently for the site. IE11 is particularly agressive in this repect. I don't think I've logged in on any of the browsers and terminals I use (4 workstations and 2 laptops, each of which has up to 5 browsers available for testing this and other projects etc).
Please bear in mind that this is currently a FREE access project for everyone out there (with an option to Donate to keep it going that is being pretty well ignored except by one kind soul) that four people have given up their time and energy, also for free, over the past three months to get it going after the initial idea came up.
There were a lot of problems that had to be worked around, at one point we had to give up and start again with the uploads to find a much more secure method that otherwise threatened the entire project.
I fund the dedicated server myself out of my own pocket and like to protect it from the nutters out there as far as possible as you might possibly imagine.
There is also now a monitor on the Cookies and their expiry dates in an effort to see if anything unexpected might be happening and to see why yours might be failing if you want to try again. There should already be specific evidence of this in the logs but I can't find anything at the times you were trying.
So. if you want help
PLEASE ASK FIRST. I don't see any major problems with the security requirements looking at the logs that would cause me to change the requirements at this moment, certainly the extra effort needed initially is not a valid reason. Changing your account details etc is underway but needs some more work that I could have continued attended to had I not spent hours working on this reply in between other chores/mails/phone.
Ron: re ISP details. As roseway says, a Host lookup on the the IP Address that is returned to the server by everyone (and I have a massive cache of Host lookups) will return enough info to determine it in 90% of cases, the others need a bit more work - such as our Swiss LIVE user. And OK on it as an option which I may well do. Most people on TBB state their ISP in their sigs anyway, not so much though on Kitz. I've removed them for now until I can attend to the user comments later.