That probably didn't do it any good! 
Send me an email with your address and I'll send you a replacement. In looking at the circuit, I wouldn't expect that to cook anything else, but I could be wrong. Actually, with the usage of that particular cap, I'm surprised it cooked, it actually has very little voltage across it in normal operation. I'd actually expect the buffer to probably work, at least for some time, with that one in backwards. I'd look around for any other component issues, for sure check C1 and C2 for proper orientation, they will greatly affect operation!
Specifically, note that the stripe on both of these faces the power jack.
