On my recent QDX-M build, I was careful, inspected joints as I went, cleaned things, took my time. But once I got to the connectors, I figured I was nearly done, and I soldered them in relatively quickly. And then was surprised when the BNC plug wouldn't latch! Guess I should've checked the BNC connector BEFORE I soldered it in, this one was REAL bear to remove with my iron! Fortunately, I had a spare from an early QDX build I screwed up.
So let this be a reminder to others...ALWAYS inspect your components BEFORE soldering!