Hi
This is an issue with K2 and doesn't have anything with Template.
More to be exact, it's related with K2 cache.
Normally we develop new template using old project, so you will find K2 images on cache directory that were used on previous projects.
So it seams that K2 brings up automatically old images from cache.
If you clean cache this will not happen again.
Actually, i always thought from my experience on K2 that handling cache is something to improve on this component. Here's an example: to change an image from an article, first you need to select "delete image" option, save the article and only them include new image. If you don't do it like this, image will not be replaced.
Maybe in next K2 version (hopefully with J!1.6 support
) this will be improved.
"Is there a way to control which default image will be used?"
I'm afraid not.
Cheers