RAYZOON

Assuming Jamstix sees diminished power, its choice is to remove all LH and all RF actions. RF is the only Bass Drum action.
I was sort of suspecting I needed to do Install Pack on the additional packs and it was skipping actions because the drum requested was unavailable. Because I do not recall having imported the add-ons. However, the Quickstart menu thinks they are installed and the add-on drummers appear to be installed.
Unfortunately, I did not freeze Jamstix prior to the crash when it was being well-behaved (i.e., playing everything). The project is at the point where previous midi tracks are now converted to wave files, so there is no particular thing jamstix can look at for dynamics information. In order to increase power must I now insert the plugin (audioM8) to an audio track so Jamstix has an idea of the current dynamics? If so, what piece of state was not saved that allowed Jamstix to function well without midi information before crash/reinstall?

It's all about the song power knob. I recommend you set the mode to 'Jam Without Input' and set the song power knob to 100% by holding the CTRL key down and left-clicking the knob.

Power Knob snaps back to 0 as soon as I start playback. I get some power back if I Jam with Audio (it gets to 16 and allows some LH action). It seems to zero power out on Jam no input. With Jam with Audio I also seem to get about every fifth RF action. With only about one action per measure, this is pretty sparse.

Another anomaly is that there was a drum solo in the old version. It wasn't supposed to be a solo as I just hadn't got around to recording the additional tracks, so only drum was playing for 8 measures. Now it goes dead silent except for two strokes half way through and it plays the fill that leads back into the song.

Make sure to switch to 'Jam Without Input' so you can manually control song power.

yes. I called it Jam with No Input but I tried that and it resets the knob back to zero on play.

That is odd. Do you have an automation envelope for 'Power Level' in the host?

I never set an automation envelope. However, I will double check one is not set (in case Sonar added one). I'll also try controlling the Power Level to something higher than what it wants to do. I noticed I had not re-licensed Jamcussion in JS2, so have done that now. Are there other add-on packs I'd have to go back and reauth?

I am also going to do some searching for the midi as I typically save that out and use that as a seed for JS(2) after I get it like I like. Hopefully it was not on the drive I lost. And hopefully this was no exception with this tune.

MetalPak and BonzoPak will also ask for the code when you load one of their styles or drummers.

If possible, could you send me the Sonar project?

I can send it later today (I think). I'll send you a link via SendSpace. It uses Bonzo pack. So that may be the problem? I don't recall having done anything to re-license it.