Thanks for the tip. I didn't have to use the disk; just reinstalled the plugins.exe file from the original installation, and the PG plugins are working fine now.

As for the drum triggering problem, it used to work through my M-Audio Firewire 410 external sound card, with the midi cable hooked between the Zoom drum machine and the sound card and the sound card hooked to the computer through the firewire cable. In PowerTracks, I set the PT sync source to Internal; I set the MIDI Out to Sync Output Port 10 (the drum machine's MIDI Receive channel is set to 10), Send MIDI SPP, Send Realtime Messages, Disable Special Controllers, and Send MIDI Time Code; I set MIDI Thru to Enable Thru (tried both Global and Track-Specific)and set the MIDI Thru mapping parameters to Channel 10, Key 0, Velocity 0, and Port 1; in the Metronome I've checked Recording and "Metronome shuts off after count in," and the MIDI Metronome options are set to Channel 10, Key F#3, Velocity 127, Duration 2, and Port 1 (most of which mean nothing to me; they were defaults, as far as I can recall). I set the Zoom drum machine to Play, with a drum pattern in queue, and hit Record in the PT program, and the metronome counts down to 4 -- at which point it used to trigger the drum machine; but it doesn't anymore. Any number of these settings might be incorrect, since, as I say, they mostly mean nothing to me. I'm a guitar player, not a software engineer or programmer.