Geoff Cattle
Found it! Now it's saved as a Project Template, with some of the audio missing. I keep getting the old 'Silent Buses' dialogue as well. Trying to put 'WarnSilentBuses=0' Into the initialisation file no longer works; press 'apply' and the text just typed disappears . I hope this is transition teething problems for Bandlab. 
 

I think there may be some confusion. Project templates are not intended for saving audio. They are to save tracks and effects to start a NEW project. Audio won't be saved with a track template.
 
The ini file setting should work identical to SONAR there are no changes. Its best to edit that file while SONAR is not running since it may overwrite your changes otherwise.

Noel Borthwick [Cakewalk]

Geoff Cattle
Found it! Now it's saved as a Project Template, with some of the audio missing. I keep getting the old 'Silent Buses' dialogue as well. Trying to put 'WarnSilentBuses=0' Into the initialisation file no longer works; press 'apply' and the text just typed disappears . I hope this is transition teething problems for Bandlab. 
 

I think there may be some confusion. Project templates are not intended for saving audio. They are to save tracks and effects to start a NEW project. Audio won't be saved with a track template.

 
I know. Yet my project was saved as a template. That's what I don't understand. I have made a number of project templates, and they're saved with the .cwt extension. My projects are .cwp (I don't do .cwb bundles). After searching my drives for my lost project, I found it as a project template, including all the saves. Before setting up the project, I dis save as a .cwt template, but after that, continued to save as a .cwp. Unless I hadn't, and autosave and my ctrl S was updating the template. The latter is possible.

If you missed doing a "save as..." and changing the format back to a cwp, it is very possible that you were working on a cwt the entire time. I never knew they would autosave though, and that is a good indication of what happened.

It does bring up a good feature to have a warning dialog when saving a template that tells the user "You are saving a template file, no audio or MIDI information will be saved!"

Track templates are another option to consider, since they allow surgical extraction and insertion while always working with a cwp.

mettelus
If you missed doing a "save as..." and changing the format back to a cwp, it is very possible that you were working on a cwt the entire time. I never knew they would autosave though, and that is a good indication of what happened.

It does bring up a good feature to have a warning dialog when saving a template that tells the user "You are saving a template file, no audio or MIDI information will be saved!"

Track templates are another option to consider, since they allow surgical extraction and insertion while always working with a cwp.

I think that's hat happened. I organised a project template, loading my guitar and drum track templates. I think where I WENT WRONG (I hate admitting this), is that I started recording some takes, to get the EQ on each instrument about right. As I am new to creating project templates and have only done a few recently, when I saw the progress bar flash, as in when the project auto saves, through habit I carried on as I would when working on a project.
 
On the plus side, there's been some interesting responses on this thread. All I lost was a couple of minutes' rough guitar/bass guitar takes and some markers, all the work put into setting up the project was intact; so that time wasn't wasted. Now that I am aware of this, I won't make the same mistake after a really good recording (Mileage may vary according to what is considered good, according to taste; for me it's being able to hear each instrument and when they sound together as a whole they sit in and don't compete, I struggle on in pursuit of that and have decided to get the best tone possible, and spend time doing that before committing to recording and correcting everything afterwards -that's my approach now)
 
mettelus, your suggestion; "You are saving a template file, no audio or MIDI information will be saved!", is exactly what I thought last night. 
 
Cheers to you and all who posted here.