Hi all,I confirm that I have experienced the same problem. Tracks with tempo changes don't render well at all with fast bounce enabled, but are fine with it disabled.
I have also found out that for the price of a monthly sub to SPlat, I can buy Reaper 4 which is doing exactly what I need and with a lot less fuss. Also, for a reason I have yet to find out, Reaper also seems to impart a lot less noise into my tracks.
I am a user from Pro Audio 9 but I am coming to the opinion that SPlat is becoming all fancy toys and less functional.

I think your analysis is in error, but that's just me.
 
Noisy tracks? if you are indeed getting this it's nowt to do with Sonar, otherwise all hell would have broken loose.

I will investigate this ASAP. 

Sir William
SPlat is becoming all fancy toys and less functional.

Just poking my head up to say I disagree. Sonar is pretty hugely functional. It does have toys too. Have you discovered the record button? That's the real key to the thing.

gswitz - and here was me thinking Americans don't do sarcasm!

I do sarcasm pretty well myself

What are the bits people would define as "toys"?

Sir William
 
Reaper 4 which is doing exactly what I need and with a lot less fuss.

indeed it can, and REAPER 5 is just around the corner, looking forward to that :)

To some, putting instruments you can't play in a tune takes the musicianship out of the performance. It is "musical" scrapbooking, if I may coin a term.. I do it for drums....we record the rest.
 
Not a big fan of drive-by posters who spew another program's name and then leave. For me, it just makes me like Sonar even more!

Sir William
I am a user from Pro Audio 9 but I am coming to the opinion that SPlat is becoming all fancy toys and less functional.

I think this poorly phrased. I would not put it like that.

However I would like to see a return to fixing and improving the meat and potatoes of Sonar (pre Platinum). If we look at the last few releases it's been more about fixing issues with the new Platinum features. I'm glad they are being fixed rather than not, don't get me wrong but I want existing functionality improved. I hope there will be less new headline features, and more exisiting workflow tweaks and fixes from next month. More streak and potatoes and less cucumber please.. Core program still needs improvement.