Good evening everyone!

Simply put, I loaded up a project I had worked on a few days ago, and most of the audio I had recorded at that time is just gone. No missing audio dialogue, nothing, it's literally just not there. I was wondering if anyone may know what the cause may be so that I could avoid doing whatever it is that made this happen.

Thanks, and take care!

Nothing obvious comes to mind unless you've accidentally hit delete whilst you've had a bunch of tracks highlighted! Try searching your audio folder(s), the actual track .wav files may still be there somewhere. 

That's right, look in the audio folder for the project. It's not easy to delete stuff.  And of course you can load up your back up copy... :) 

^^ Unless you actively delete the audio from the Audio folder (may be per project, which is preferred), the audio is there.

I typically save often and last night forgot to. After recording 3 tracks I crashed SONAR messing with drivers. Lost the project file changes but simply imported the audio (right click an audio track) on three new tracks.

This happened to me twice a couple of weeks back, during the same session.
 
Even being almost OCD with saving and really being on the ball with what was happening, I just found a couple of clips simply missing. Not a massive deal and we re-tracked the parts that were gone, but it was extremely odd and random. No idea what happened, and no steps that I could think of to make a recipe for it to send to support.

That's what I ended up doing: re-recording the parts. The problem I have with searching through the audio folder is that I find it difficult to find the one I was actually using. I tend to do a lot of missed takes.
If it happens again, hopefully it will be nothing too important. =-)

Hypocrita
That's what I ended up doing: re-recording the parts. The problem I have with searching through the audio folder is that I find it difficult to find the one I was actually using. I tend to do a lot of missed takes.
If it happens again, hopefully it will be nothing too important. =-)

For future reference the way I've gotten around that in the past is sorting the Audio folder by Date Created (you will likely have to futz around with the Windows Explorer filter options at the top of the window... basically just right click in the headers and select Date Created and a new filter will be added).
 
Then, if you are anything like me, your best takes will be the most recent takes so you can just reimport those. Or often times I'll have been working with the project so much I have a general idea of either a) which take was the good one or b) I can just listen to the file and know whether it's the correct one or not (you can just open the wave in Media Player or inside Sonar there is a little audition thingie in the audio pool section... or whatever that's called).
 
Of course if you are using the Per Project Folders this is easier. If you have Sonar setup to use the Global Audio folder... not so much but you can still KIND of sort and find stuff. So check to be sure you do have things setup to use Per Project Folders. It will make your life much easier in many ways and not just for stuff like this.
 
Another thing that's helpful in these situations is the Import at Original Timestamp option (or whatever it is called) so clips recorded from anywhere on the timeline OTHER than the very beginning import to the correct spot.
 
Cheers.

I've had this happen before and once I even somehow deleted the master bus. Haven't run into this again since I started tapping keypad 5 (num lock off) to select none before selecting the items to delete.

Hypocrita
That's what I ended up doing: re-recording the parts. The problem I have with searching through the audio folder is that I find it difficult to find the one I was actually using. I tend to do a lot of missed takes.
If it happens again, hopefully it will be nothing too important. =-)

Learn this habit now (some DAWs force you to do this which is a great feature) - First thing after inserting a track is to name it. The audio recorded will then carry that name, and makes finding things a lot simpler when you have forgotten. Track X / Record Y become meaningless then. After region effect work, you also can get things like Melodyne Z which is unhelpful. You can also rename tracks and clips specifically in the Inspector tab.