Works for me with IE8 and IE7. And it used to work with IE6 when I had that version of the browser. Maybe you have cookies disabled in ie? Or maybe there is already a cookie saved for that guest user.
Since you did not say what was wrong with the behavior in IE we can only speculate on the answer.
I have ie explorer 8. After eliminating all historic data, including cookies, I tried to access http://nuno-hoffmann.penide.net with login: guest, password: 12345 .
It doesn´t work; clicking the send button simply seems to reload the login page leaving the blank fields blank again.
I´m working on Windows Vista if that´s important.
Any more information you need to know about the bahaviour not to have to speculate about an answer? Thanks for your help!
Well, I can confirm that it doesn't work with that link. But I think it's not a Zenphoto problem. If I use the real link (http://subsi.de/nuno/zenphoto/), then it works. So the problem probably has to do with an IE quirk in regards to using HTML frames to reference an off-site Zenphoto installation.
Well, password remembering requires cookies or sessions. If you have not set the gallery sessions option then I think it safe to presume that IE is not using the same algorithm for storing the cookie as for retrieving it when there is a frame involved. Try the gallery sessions option.