Handy yet stumped - light fixture

I returned from out-of-town and the 4-bulb light fixture in my bathroom wasn't working at all. I've checked and replaced the bulbs (all ok), and used a current detector to confirm (at least some) power to the switch, power to each individual bulb fixture, and that power to each fixture is switched on/off when the switch is switched. I assume I don't have a short because I can still detect power in each fixture and the breaker hasn't flipped. I am stumped. Seems like if the fixture, switch or wiring went bad, I shouldn't be getting the results I am. Could it be some kind of partial short? Any suggestions would be appreciated. Thanks!