Bob,
My guess is that the sear bar plunger is not returning for some reason. With the gun unloaded, hold the trigger down, c*ck the gun (by pulling the toggle back until it cocks and letting it return to battery), and then release the trigger. You should here a slight click when trigger lever releases the plunger. If you don't, the plunger is not releasing.
As stated above, a likely problem is a gummed up plunger. I suggest soaking the plunger end of the sear bar in penetrating oil like Kroil and working it to make sure it is completely free.
Another possibility, if this is a mismatched gun or has a mismatched side plate, is the trigger lever in the side plate. If the trigger lever in its retracted position does not clear the plunger it cannot reset. If this is the problem you may need to polish a little more of a bevel on the back of the trigger lever using a fine Arkansas stone. Hope this helps.
KFS
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