Okay, I guess by posting the whole story with all the details threw you guys off.
Here's what I did this time: I uninstalled Weapons for FSX. I re-installed it. I started my sim and chose the FA-18 that it put the weapons in against by default. I didn't modify any other aircraft.
Panel comes up blank. I pressed Shift+1 to bring up main panel, shift+2 to bring up HUD gauge, and shift+3 to bring up HUD background. I clicked the Master on the panel.
Then, as I clicked into this browser window and began typing this message, as soon as I pressed the space bar for the first time, the RDM REM showed 189 and the sim started making an unending clicking sound - which I assume to be the guns - and it hasn't stopped. In fact, in the course of writing this statement, my rounds remaining has decreased to 99, decreasing a little bit every time I press the spacebar.
I switched the selector over to rockets, showing and just now it fired them all, but it is still stuck on an endless sound loop - still playing the gun sound.
The effects are appearing when I press the spacebar (but interesting that it doesn't matter where I am in when I press the spacebar; it reacts to ANY time I press the spacebar, whether I am in focused in the FSX window or not), but the sound starts the first time I press the spacebar and never stops. I really wish I could make the awful clicking sound stop.
Even when the rounds run out according to the counter on the panel, the sound still continues.
I've been warned in the past about Captain Sim products, and this would seem to confirm it - I'm too stupid to use a Captain Sim product. I just wish I hadn't spent the $22 on this. I read the favorable review at FlightSim.com the other day and thought I would give it a go, despite the flurry of negative reviews at FSPilotShop.com. Man, do I feel really dumb now.
Oh, well, off to uninstall it again. Is there any way to get a refund? Apparently, there's no support and no documentation. I wish the review at FS.com made that clearer. I didn't know I was paying $22 to be a Beta tester.