Having Trouble Saving File In X1

I just recently upgraded to X1 from 8.5. I used Sonar 5.0 producer for a long time before I upgraded to sonar 8.5.

I worked on a song, that I originally created in Sonar 5.0 and ended up inserting and deleting synth instances   twice last nite.

I save the song about every 5mins before closing it.  When I  re-opened it,  all the instrument settings were gone. Of course there is no sound at  playback.  The 7 insert Synth instances that I set up, were still there but all the instruments that I assigned to my orignal  midi tracks show output and input assigned to my FastTrackPro(external). default midi channel is blank.  The same situation with the synths I input.  
I inserted 3 Session drummer, 2 Session bass, 2 DimPro. X1 added 3 extra session drummers. HELP.

I had to delete all synth instances and re-insert them. wassup?? Now Im afraid to update my original tracks for fear of not being able to save them

Do I have to install a quick fix?
I have a dell inspiron, 4g rams, 640 gig hard drive, Win 7, FastTrackPro

Thanks

Gene

Thanks Charlie for the feedback. I have back ups of my originals.

I think what I should do is create a new file in X1 and cut and past my midi notes into the new X1 tracks.  I had to so something similar in 8.5 to get a song working. Unless anyone else has a suggestion.

Thanks again Charlie

Gene

Thank you for that suggestion.  That's exactly what Im doing now.  I also use staff view all the time and have lengthy notations so  I copy the notes to the new projects and  go on from there. All tracks play fine except for the random click sounds.

The other thing I discovered is that X1 has less notation features than the previous Sonar versions.  We need those staff notation features back please. Many users still write.  I hope there are plans in the next update to bring all that back.  Unless Im missing something? I just found the synth rack last nite.

Thanks Bristol for the feed back.

Gene