ARrrghhh...where is 20 secs of silence on mixdown coming from...?

I'm mixing down a final of a song that's 3:45 in length and when I render either a wav or mp3, there's 20 secs of silence at the end.  I've selected only the range of bars for the song, I've got VCC, VBC and UBK-1 on the final and I can't figure this one out...what am I missing?   I've done this a hundred times...stumped.
Probably something simple...

Twenty seconds seems long for this, but if you have an effect with an inaudible "tail" it could make your project long by several seconds.
 
The "play effect tails after stopping" checkbox problem.

But he's selecting the range of bars. T should end at the section.

Do you have another audio editing program? If so, I highly recommend editing your exported mixes from Sonar this way. You can trim up the song in there, and perform tweaks such as compression, eq, etc. You can even do this with an inexpensive program like Pyro. I personally use Steinberg's Wavelab....the "elements" version is $99 and it's a great external editor.

Well outside of this little brain-fart, I've never needed an outside editor for trimming tracks.  The only thing that would be great in Sonar is a mastering tool.  I don't mean a limiter, I mean like Nero where you can red book burn a CD and write isrc data to the song file meta, etc...

Sonar will stop automatically in playback mode when it sees no more data or audio past a certain point.
 
If a track has a series of dots down the center of it, that indicates there is something further to the right. Sonar will play to that point. This seems to happen most often when I import audio and midi. If I create a new track and record audio to it, that mysterious stuff to the right never occurs.
 
I have had a few tunes that had silence about as long as the song itself..... somehow, something was placed well tot he right in one track.... look for the dots........................................................... follow them and you'll find it.
 
I always export my files to a certain folder on the desktop and then I re-open them with a WAVE  EDITOR from NCH called WavePad. Its free. I use it to trim the count in silence and also to trim the end of the song. Every song I export has silence in both locations and I want the song to start less then 1 second from the start and stop when the last reverb trail has faded sufficiently so it doesn't sound chopped off.

Why is that suggestions that "make sense" never get incorporated into anything???
Inquiring minds want to know!
 
Just sayin'...
 
T