I started poking into this today on my side, cleaning up some $array[string] to $array['string'] type stuff, trying to clean out any funny errors.. Some remain that could really be wrapped with isset, but that's too much trouble and they're just warnings anyway.
None the less, I've had zero luck getting the calendar to work right. Everything looks the same between yours and mine, but when I submit the time, yours jumps to the nearest time and shows only that range and mine just resets the timespan and shows all positions.
I've replaced my index.php with the latest server.zip one, just in case I'd broken something in there tinkering.. I replaced my config.php one with the dist one, just in case there, notably the date format, but that didn't matter either. I double-checked the calendar stuff, etc.
I also copied of my trackme web files, copied my config.php into the clean server.zip files, and tried it there. Same.
So only thing that I can think of is the server? CentOS 5.3, PHP 5.1.6. Staryon, what version of PHP are you running?
And, is anyone else running their own server see the same thing?