I want my intermediate size (both for landscape and portrait) to be 690 exaclty, so I enter 690 as the Intermediate width, save the config and try and upload an image (portrait)
It uploads them ok, but when I put them in an album, select the name and type in a description, I get a blank page (or page could not be displayed) when I click OK to complete the upload
Returning the value from 690 to 400 it starts to work again.
This is with aspect ratio set (not height/width) using the latest stable release of Coppermine
I can't replicate this problem on my 1.4.2 test site. I set intermediate size to 690, use max aspect, and successfully uploaded two 1600x1200 images. Did you perform an upgrade or do a fresh install of 1.4.2?
Follow the troubleshooting steps (http://coppermine-gallery.net/tutorial/uploads/troubleshooting.php), then provide a test user/password and a link to your site.