Waldo

Im getting the same issue, it seems you are not allowed to have space in the user name.

Single word only however even the _ or – doesn’t seem to help.

Unexplained but this started to work, I did not change anything.

this might help, got it from an earlier post,

Let me note :

if you add the gallery.php (form the plugin folder) to

{wordpress dir}\wp-content\themes\your theme directory\nggallery\gallery.php

then you can call it with [nggallery id=x]

if you need another template use the tag [nggallery id=x template=mysample]

and NextGEN Gallery look for a file in

{wordpress dir}\wp-content\themes\your theme directory\nggallery\gallery-mysample.php

There might also be other relevant discussion on gallery ID and templates read the whole thread for more.

If not WPremix then what have you found that works for you?