Hi Don, and welcome to the forum. Congratulations on your Luger .
As Doug mentioned, the disconnector is the small plunger at the front of the sear bar. If this sticks and doesn't push back out at the end of the firing cycle, the trigger will not appear to reset. The sear bar may require a soak in a good solvent, or there may be a problem with the plunger or it's return spring.
The correct operation of the receiver includes the magazine follower pushing up on a small hold open lever that is on the top of the frame. This is reset by a very small leaf spring that might be missing, mis-adjusted or broken. Take a good look at that part.
You should not have to drop a magazine a full centimeter to ensure proper cycling.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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