I keep getting the [bg|...] code only when displaying the node, no gallery whatsoever.

I get for example:

Node text blah blah...
[bg|albums/0/24]

I remember that the 6.x-3.4 version worked fine on my site but at that time I was using the Drupal default "sites/default/files" folder as the location of my files. Now I use a different folder. Can this be the reason ?!

I have Lightbox2 on.