Issues remain the same still with Jamaica Plain update....no, it's worse.
Now I cannot see projects icons not even in on line mode!

Try temp disabling your firewall then starting Sonar.
Obviously don't forget to switch it back on..
 
Ta.

Doktor Avalanche
Try temp disabling your firewall then starting Sonar.
Obviously don't forget to switch it back on..
 
Ta.

That did not solve the problem here.
 
Anyone else?

Start screen opens blank also since Jamaica Plain update. Firewall turned off (temporarily). The new project tab in the start screen will launch a new project. When I try to open the video tab it tells me I'm disconnected from the internet, which isn't the case. All else working fine.

Start Screen populates as it should here, irrespective of internet settings.

Ditto - no missing anything in the SS.   My internet connection is via an external wireless adapter (desktop machine) that's usually turned on, and while I use Firefox (vs IE) for all internet usage it's usually closed.   This is on Win7 SP1.

This is a BIG mystery.

OK lets see if we can figure this out. First make sure that your project folder is listed correctly in preferences under files. Then when you start Sonar what do you see? If I recall correctly it is not populated until you open a project using the existing project menu selection. Open a project from the browser that opens from that item and save it.  You may need to reopen the Start Screen. You should now see that project listed. A snapshot of it should be there in the SS.   
 
Let me know if this is not the case.

I don't know (yet) if this has changed with the Jamaica update, but in Ipswich & previous, a project would not appear in the SS until it was saved.
 
Simply opening & closing a project will not populate the SS

[SOLVED] 
Thanks to Joe Cotton from Cakewalk Product Support Team and deleting some register keys now everything is fine.