Renaming AUD.ini does the same thing the CTRL+SHIFT while starting SONAR does, except for that file only.

Karyn, what are you using for a midi interface now?

Try changing your new interface's bit rate/depth to match what you used in the old project first, before opening the project. It kind of sounds like your interface is hanging when trying to switch. Just a thought...
 
Regards,
Dan
 

ok, several reboots and panics later....   (I dropped the Faderport usb cable behind the back of the desk and had to mount a major expedition to retrieve it..)
 
Delete aud.ini  Didn't help
Start with ctrl-shift   Didn't help
Open project with Shift (say no to all plugs)  Didn't help
Remove all midi  Didn't help
Remove audio interface  Didn't help
 
 
Some combinations of the above actually made it worse,  new projects that would open stopped opening...
 
I've managed to restore it back to the original ini file and midi/audio config and now I'm back where I started.
I can create NEW projects perfectly fine and everything works exactly as expected.
I can't open old (read last week) projects that used my old interface.  Sonar goes into a loop and locks up.
 
 
Getting desperate now...

JonD
Karyn, what are you using for a midi interface now?

I don't have a specific midi interface any more.  It's all USB devices with their own midi...  I need to get one.

hi Karyn, in Preferences/Midi/Devices, perhaps still try to get a midi device set 
If you have no Midi controller, perhaps try ticking 'Microsoft GS...' + 'use friendly names' + 'Warn about no Midi devices.
If you have a midi contr. set, check if it's set in 'Midi'/ Instruments'
good luck

ok, I'll rephrase that.
 
I have midi devices configured in Sonar.
Faderport
Studio 192 (for preamp control)
Alesis USB IO drum trigger
m-audio keyboard...  oh, that's missing... 
 
All are actually USB devices that report as midi, I don't have an actual midi interface anymore. My old audio interface had midi ports on it, the new one doesn't.

Hi Karyn, sorry, again didn't look into it very good...
personally I would return the Presonus and get a RME for the same money with Midi ports (RME UCX or RME 802)
they're professional gear and known for good preamps too, go up to 192Hz.
German company so usually good customer support
Or contact Presonus (forum) what to do...

and you have your Midi device(s) with a Midi-USB converter conected to your computer and then set up in sonar as Midi device ?

Just throwing some darts into the air.  Obviously feel free to ignore if you feel I'm way off-base....
 
Just to rule out that this one project is corrupt -- I assume you've tried to open more than one old project...?
 
MixControl -- Same version as before?  Was it completely uninstalled/reinstalled?
 
Any other utility in startup trying to communicate with the 2626?
 
If you're not using your firewire anymore, wouldn't hurt to disable the port.