As stated by some of my colleagues, the glass humidors do tend to leak, now analog hygrometers are sometimes tricky to salt test, but I hear you have a digital which will make it a little easier. As far as setting up the box, a nice trick is to take window sealer like a nice caulk but it has to be clear, and seal the box edge, then once the sealer has cured, just take a sponge (new of course) and moisten the cedar with it (use distilled water only) and repeat every so often to season the box for a few days, do not put cigars in the box during this process and if the % dips when you put sticks in, don't worry that's normal, the box should regulate itself after a while. 60% humidity is perfect for 99% of cigars, and yes the taste changes with humidity level. Make sure that it stay constant and that there's no sudden shift in %, it'll cause physical damage to your cigars as well as make them bitter. Well, good luck and let us know if you need help and tell us how it comes out.