To make sure I also tried renaming it manually. Still the problem exists. Now I am wondering what settings does my old AUD.INI would have preserved. Should I retrieve it back. I guess I can ignore it.

Wait I do find few more INI files in the same folder. Will resting them help?

EdiT

If you want to reset everything, holding the CTRL+SHIFT keys while starting SONAR will overwrite the files in your user folder and some registry entries, returning them to factory defaults

Cool. I'll try that and get back to you :)

Tried it with no use. Are you sure that will reset everything? Cos all of the INI files other than AUD seems unchanged with same old dates. I did get a pop up saying "SONAR will now personalise your user settings by copying application data files" when I opened holding down ctrl+shift.

I don't think resetting your config will change anything; this just looks like a Sonar bug, plain and simple.
 
I have seen soft synth inputs get screwed up from time to time and I didn't know what caused it - this seems like a candidate as I often use track templates.
 
I've also seen track templates mess up drum maps quite significantly too.

Oh gawd! I did renamed the entire app data folder as Sonar Platinum Backup and when I started sonar it did create a new app data folder itself. But no use, the problem remains.

Kylotan
this just looks like a Sonar bug, plain and simple.

If that were true, I would expect to have seen dozens of threads like it by now, and I've seen none. It may be a bug, but hardly 'plain and simple'; clearly the OP's particular environment is a factor.
 

I've also seen track templates mess up drum maps quite significantly too.

 
Drum Maps are a whole different issue. Soft synth MIDI ports are assigned and numbered in the order they're inserted. If the new synth is on a different virtual port than when the template was originally saved, the map is going to be wrong - unavoidable, but easily corrected.

I confess I never ever use simple instrument tracks, so if that plays any part in this, I will not have ever run across it.
 
I always manually insert my audio and midi tracks, because I like the deliberate nature of insert/name/route that makes sense in my head - anyways, everything always works for me, by doing this myself every time I ever insert tracks/synths.
 
Bob Bone
 

Alright guys I will have to fresh install and see. I can't do it right now, I will have to wait a few days. Till then if anyone got any idea to solve this u are welcome.