@mikeschumann: Yup, I've duplicated this issue and created a high priority item. As far as I can tell, your caption template will always display one less column than what you specify in the settings. It appears something's off in how the column widths are begin calculated.
Since I've seen a few issues on this, and given that you named the thread so well so others can find it, I'm just making this sticky so others with the issue will see it.
For anyone else, if you having this and want to post details below, please do so. There's no quick fix for now, we just need to solve it and it should be in the next update, probably in about a week.
Until then, you may want to switch to standard thumbnail galleries rather than using the caption template.