Teds_Studio
Sorry I've let this thread get buried for several days.  I just tried the Bass Station in X3 and it does the same thing.  It adds the synth just fine, but as soon as I try to open the GUI it white screens Sonar and locks up.
 
I can't even do the offline activation since the plugin will not even open up.  I found the instructions for offline activation that Matt referred to, so once I get it to open I can register it.
 
I just contacted Novation via their contact page to try to find out what is going on with my install.  I downloaded the install directly from the Focusrite site from within my account.

Strange, do you have X-Ray enabled?
Edit > Preferences (advanced) > Customization > "Enable X-Ray"
 
What happens when you un-tick that? Same results?

Hey Dan,
 
I just tried unchecking "Enable X-Ray".  Same thing happens.  I add Bass Station as a synth...but when I double click the icon to open up the GUI it white screens and says that Sonar has quit working.  This happens every time.

Also just tried uninstalling....and reinstalling JUST the 64 bit.  Still does the same thing.
 
Guess I'll wait to hear back from Focutrite / Novation.

I had the same issues.  Turned out to be the 32 bit in 64 bit host and bit bridge.  In X2a I used jbridge and the issues went away. I then found the 64 bit version redownloaded, got rid of the 32 bit .dll and that took care of it also. In my update to X3 the 64 bit version is not giving me any issues. Also be aware that it will download both a mono and stereor version of the plug so two will appear. IHTH...

Well...I just tried again and uninstalled all of the Bass Station.  Then reinstalled JUST the 64 bit parts again.
 
Even re-downloaded the install file from Focusrite website.
 
Still doing the same thing.  I have some kind of conflict going on with the synth somehow.

Wow.. Can you check in Plug in manager properties and ensure that the uniinstall did not leave an older version of the dll. This could happen if you have a different path to you vst files than the default.  I choose to manually delete the old files because I keep the different dll's in different folders where I can.  If bit bridge is trying to wrap it this is where I saw my issues. Also try downloading it from the Novation site they are showing an update to the program as of April 2013. The version there is 2.0. IHTH..

I won't hijack the thread but was interested in the X-Ray comment.  Sweetwater advised me to disable it, but I went against their advice.  I use it all the time with the T-Bar on the V-Studio and it is awesome to fade out a VI to look at a score, or to fade Melodyne to do some work without closing the plug in window.
 
 
Edit: I went against their advice only after confirming that I could not correlate X-Ray off or on to any bug we were trying to resolve.

Made sure no other instances of Bass Station was in the VST folders....even made sure all the references were gone in the registry.  The file I downloaded from Focusrite is the same as the one on Novation website.  Novation, along with Ableton I think are owned by Focusrite.  So I have the latest install file.
 
Maybe they can come up with a solution when I hear back from them.  I sent in a report.

Teds_Studio
Well...I just tried again and uninstalled all of the Bass Station.  Then reinstalled JUST the 64 bit parts again.
 
Even re-downloaded the install file from Focusrite website.
 
Still doing the same thing.  I have some kind of conflict going on with the synth somehow.

Strange,  I downloaded the synth and put it in demo mode and everything seems to be working fine on my end. I haven't experienced a crash yet. I even loaded it into SONAR X2 Producer and haven't had any issues.  Does it happen in brand new projects. Also, are you using any control surface apps?

Dan,
I have tried adding the synth to current projects....and new projects both.  Same results either way.  I have no control surface apps.
 
It's really strange.  When I add the synth to a project, it's seems to add fine.  I can even open up a PRV of the midi track created by the synth, add notes in the PRV and it will show activity on the meters on the midi track...of course the audio track is blank and there is no sound since there is no preset loaded (at least that is what I assume).
 
But as soon as I double click on the synth icon to open up the GUI....I get the white screen and the pop-up box stating that Sonar has quit working.  I have never even gotten far enough for it to ask for activation (or demo mode).