Use the 'edge' buttons to position the cursor directly on a split point... 
Use the 'frame' buttons to scroll back and forth. Stop where there's no extra content, then trim... 
For precision, expand the slider at the right-bottom of the window... 
If this isn't the issue, install this release, where your result can't be replicated. For one-time licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee is required in order to register the newest. Retain your old install file and registration info. You can always revert.