I have had similar things happen when I generate any new real track instrument.

Here's what to do: Right click on an existing track and choose the option "SELECT THE ENTIRE TRACK" so it turns a darker color. Look at the tracks in the project to pick the longest one from the bunch to do this on.

Now, when you click on a new empty track to select it and choose a new instrument or drums..... they will be rendered to the proper length of the song and end in the correct place.

In the post above this one, track 1 appears to be the longest one and it has been selected. It's midi but that doesn't matter. The same rules apply if the project, when opened in RB, is rendered out as all audio waves.

Last edited by Guitarhacker; 03/02/14 06:41 AM.
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