Is this a bug that causes a crash?

I wrote out a song with the usual.
A basic boom tap drum beat, bass line and 3 guitar parts.
I move the drum track when everything is written and I'm ready to make the drums sound like someone is playing rather than a generic beat. I write out the drum track. BTW, it's the last track. I then clone it and archive the original. I split the drums to their individual midi tracks as I like 100% control of everything. I move all the drum parts to a folder and I usually make my drum folder the first folder.
 
I write the tracks in screenset 2.
 
After splitting the notes to their own track using a cal script, screenset 1, I move them to the drums folder. I put the archived drum track in the drums folder as well.
 
Keep in mind that on screenset 2 I had a midi track, in staff view, open and now it no longer exists. I keep forgetting to close the SV as it seems whenever I forget to close it, Sonar crashes.
 
So basically, if you have a SV open, that no longer exists on  another screenset not in use, Sonar crashes.
 
Has this happened to anyone else?