I have been running Webinator 4.3-Unix-w/plugin for a VERY long time. Now, on the Admin page, I can log in, get to a walk setting page, ask it to update the settings, and I get back to the login page (and the new settings were not saved).
I've tried this on Chrome and Firefox. Just tried it on IE and found it works! I guess I can use IE for this, though I rarely use it.