Strange about not working SA. That should have nothing to do with what ammunition you are using, or even if it is loaded or not. If it won't function in SA, something is wrong with the lockwork. Fortunately, these S&Ws are simple to disassemble to see the problem. If you want to try, remove the sideplate screws (with grips off) and tap on the other side of the frame with a wooden stick or mallet, or anything else that won't dent the metal, and it should pop right off. DON'T PRY IT OFF! You should look closely at how the mechanism works, especially sear engagement, and you should be able to see the problem. You can go further in disassembly. It's easy to do, but you ought to Google around to see how it's done before attempting that. Many years ago I made up a very simple tool for removing the trigger spring which helps a lot.

Some police departments deliberately disabled SA functioning in revolvers as protection against accidental discharges, but I doubt that is the case with your revolver. But who knows?

Regarding ammunition, if it's fired .38 Special OK in the past, just keep using it. Just no +P loads.