not sure this went out 11/45 status

2) My front panel has an oddity (to me). If I select say address 10000 and hit load addr the address lights respond correctly with 10000. I then hit examine and get nothing (blank data lights). Whatever... but here's the interesting part. If I keep pressing examine over and over again, the address lights count up just like they should - except they skip bit zero (the rightmost bit, either 0 or 15 whatever dec nomenclature is). I don't mean that the rightmost bit just isn't displaying correctly, the actual counting sequence acts like the rightmost bit is the 2nd light from the right. I can tell it's not just a bulb problem because I don't have to hit load addr twice to "move on", the count is smooth and sequential without the rightmost bit. Any thoughts offhand?