I pressed the save button alright.
The link that the button uses is:
http://drunkforfun.se/zp-core/admin-options.php?action=saveoptions

What exactly happens after you press the save button? The Debug record does not show a save.

It loads the page again, stating that it was saved AND asking me to create a admin account

Try the current nightly build.

I tried the trunk, same results :/

Well, I guess we cannot help you. There is code that seems not to be being executed. No good reason for that, but if the save code does not get run (and there is no way that it would not get run) then nothing gets saved.

After I do the admin accoutn creation, i can log into non admin.php admin- pages.
Changes I make on those pages arent saved either.

I enabled logging in php5 and got this error when doing an admin create.
PHP Warning: Unknown: POST Content-Length of 353 bytes exceeds the limit of -301989888 bytes in Unknown on line 0

Ok. Put this in the faq.

The above warning is about having a post-size that is to large.
Decrease it to 1200 and it'll work.

Sorry for taking so much of your time, and thanks for a good gallery

Thanks for the info. Never seen this error before.