Hey guys! I'm excited to get this thing up and running, but there are a few minor issues I need to resolve.
 
Here are the conditions.
 
- Windows 7, fully patched.
- Previous install of X1 Producer, now uninstalled.
 
Here is the problem.
 
1. Installed Platinum.
2. SONARPLT.exe splash screen / loader just hangs and stops responding.
3. Attempted to clear the relevant %appdata% folder, as this site's KB indicated.
4. Reboot and try again. 
5. Back to 2.
6. Tried a "reinstall" from CCC.
7. Back to 2.
 
Has anybody encountered this before, or know how to resolve it?

I've experienced it not relaunching if I've just closed it. Sometimes I have to go into Task Manager and kill SONARPLT.exe, which is still running behind the scenes. I usually don't even get the splash screen, though, in this scenario, so I'm not sure it applies to you, but you could check Task Manager and kill any running instances before trying to relaunch.

Yeah, already tried that. This is "first run" too by the way. I've never actually gotten in to the app outright.
 
I'm wondering if there are remnants of past installations, other than the config files, that are messing with it.
 
Does anybody know where the CCC keeps it's downloaded files? I might try uninstalling, cleaning up the file system and registry, then re-installing it fresh.

 
Did you uninstall X1 after you installed Platinum ?
 

No. I uninstalled everything, including all my third party things, like Guitar Rig Pro, before I even installed the CCC.
 
All my system drivers are up to date as well. However, I am going through and removing a lot of "little" things I no longer need or use, and cleaning up my file system and registry. In addition, the firewall and virus thing are both off.
 
I am going to try completely fresh, testing each install along the way, to see if I can find where an error might be.

Sonar prevents you from having more than one instance of the application running at once. If you try to re-launch while the app is still a live process, then it will not launch.
 
If you can't launch it ever, even after a re-boot, I would probably uninstall and re-install to see if it fixes it.
 
Short of that, I would call Cakewalk Support during business hours and work through it with them.
https://www.cakewalk.com/Support/Contact
 

I may have to do that, because I've tried everything. I'm an ex-IT dev, so I know how to cancel processes. That wasn't it. Here's what I've tried...
 
**Making this public just in case somebody has input, but mostly so I have something to review when I call support on Monday.**
 
- Backed up the CCC downloads to another folder.
- Uninstalled everything.
- Cleaned the registry.
- Cleaned file system for everything related to the install, including...
-- %appdata%
-- c:\
-- c:\ProgramData
-- c:\Program Files
-- c:\Program Files\Common Files
-- c:\Program Files (x86)
-- c:\Program Files (x86)\Common Files
- Checked drivers for video card, sound card, audio interface, mouse and keyboard.
- Checked Windows Update, including optional items.
- Rebooted.
- Moved Platinum only files (and sub items) back to CCC download folder.
- Re-installed Platinum, without Melodyne and Addictive Drums for now.
- Updated Platinum.
- Rebooted.
- Attempted to run Platinum to have it hang, and stop responding, at the splash screen.

If you've not done it, try uninstalling then reinstalling the audio drivers.

If that doesn't work try deleting (or renaming) Sonar's aud.ini file so it builds a new one on launch.

It might also be worth trying renaming all the VST folders in program files in case the hang is being caused by a rogue plugin. If Sonar then launches rename the VST folders one at a time and see when and if the hang returns. If it does then it's probably a matter of tracking down the plugin that's causing the problem by trial and error.

These have not been suggested:
Disabling the virus scanner during install
Running SONAR as administrator

A hung scan won't prevent SONAR launching since the scan is run as a separate process.
My best guess is the audio driver is preventing startup. If its a USB/Firewire device try powering off or unplugging and then launch SONAR. Also check if there is a dialog hidden behind SONAR somehow.