Hi I have found that there are a few issues using Bootstrap 3 for skinning.

I'm using DNN 07.01.01 with Ultra Media Gallery 9.3.6 I have a height set at 400px but it seems to automatically make it 100%. I changed the skin to default gravity home and it works, but when I apply my Bootstrap 3 skin it stretches. http://spitfire.wowinteractive6.co....fault.aspx

Any advice?

If you will look at the new DNN 7.2.0, the Gravity skin has been redesigned to be a Bootstrap skin. You might want to take a look at that (You probably can extract the skin from the upgrade package and install it in your site, even if you don't want to upgrade.)

I'm not sure what is going on with your issue. It is "just" CSS, to you should be able to copy what is done in the Gravity skin.