I've had what I think is the same problem you are describing where you log in and the forum doesn't complain about your password, but then you aren't logged in - when using Chrome. But it works fine in Firefox.
On my "production" forum running on the Nabble server that happens when there is a mismatch between security (SSL) on the forum and on the website on which the forum is embedded. Do you have your forum embedded on a website? Do you have SSL enabled on both or turned off on both?
If what you mean is that all of those pages have SSL enabled and on those pages you also have Nabble forums that don't have SSL enabled then you need to ask Israel to enable SSL. But you will also have to have a custom domain name.
I find it best to start a new thread entitled something like Please Enable Security On My Forum and give a link to the forum. That gets Israel's attention best.