Old thread, but just for people who might stumble on this in the future, I just ran into the same thing on a new CW380. Took me a while to figure out why the slide wouldn't go on, and it was more frustrating because it kind of locks up between the stuck ejector and the cam, that now has a hard time rotating when you pull the trigger, with the slide pressing on it. But as you say, with a little push on the ejector with a screwdriver (or chopstick, or whatever) up through the grip, the slide goes right on. And customer service may be right, since the last time I installed the slide, after maybe 400 rounds, a little jiggle of the slide got the ejector past the obstruction. And it hasn't seemed to affect performance at all.