Hi, here's the code that I put into the article/module:

{youtube}VOBPVkJXxXM|600|450{/youtube}

however, the video shows up but it's about 800 pixels wide by about 30 pixels deep.

I've used this many times, but I've never seen this happen before... any ideas?

Hello,

Can you send us a link to your site?
Also, when using the responsive template the size attribute is not respected and a 16/9 ratio is being enforced.