I just purchased the base pack and I thought successfully installed it in FSX-SE.  When I load into the sim the airplane the right rear tires sink into the pavement.  When I look at the fuel and payload settings in FSX the numbers match left and right but the CG is shifted to the right.  Any thoughts?  I've tried to reinstall and it the problem still persists.

Did you:

1. Download the installer (csp131_1300.exe) with your AV off/disabled?
2. Install the C-130 X-perience (FSX) with your AV off/disabled, and using the "Run as administrator" option (right click on the installer and select "Run as administrator")?

If you didn't, try reinstalling it as an administrator (#2). If that doesn't work, download the installer again (*#1), then reinstall the C-130 X-perience.
Hopefully that will fix it.

* If the link has expired, Log-in to Your Profile > Select product > Extended Download Service > Get New Links

No joy.  Downloaded the installer again with Windows Defender turned off and ran it as administrator (neither of which I have ever had to do before) and the problem persists.  Happens at more than one airport and does not happen with any other airplane.

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Reinstalled FSX and now problem solved.  I'll need to reinstall 3rd party stuff one at a time to see if there was a conflict of some kind.

Where you using third party scenery?