when calling getSizedImageURL like:

<img src="<?=getSizedImageURL(400);?>"></img>

getSizedImageURL is returning an empty string. Is this a known problem or am I doing something wrong?

Are you using that call on the image.php page?

Try this:
`[img]<?php echo getCustomImageURL(400);?>[/img]`

Or this:
`[img]<?php echo $_zp_current_image->getSizedImage(400);?>[/img]`

this:
`[img]<?php echo getCustomImageURL(400);?>[/img]`

worked! Thanks a lot!

Ben