I have BFD3 running in Sonar Platinum without any issues, use it every day flawlessly, though I installed my BFD3 when running Sonar X3. So we know it works in Platinum, and your computer specs are certainly up for running BFD3.
I'm thinking something happened in the install or it's a configuration issue.
Can you offer a bit more information for troubleshooting ?
How is BFD3 set up . . .
Installed on OS drive with samples / grooves on another drive, or OS and samples all on the same drive ?
You're sure you installed the 64 bit version ?
How are you inserting it into Sonar, as a Simple Instrument track, or with Audio and Midi tracks separated ?
Are you loading BDF3 onto your "Normal" start up template with other plugins loaded as well ?
Do you have a certain preset loading on BFD3 start up, in Preferences - Data ? Have you tried setting it to "don't load anything" and then calling up a different preset after the plugin has loaded ?
Are you able to browse the different Groove Pallettes before the crashing occurs ?
What about running BFD3 in stand alone mode, outside of Sonar, does that work ?