Thanks for the suggestion @rain Wilber!
I use GoDaddy for hosting so I had to make the change by adding “memory_limit = 120M” to my php5.ini file. The increased memory limit is reflected in my server settings on the NGG Overview page. Unfortunatley, that did not fix my problem. I am still unable to auto-generate thumbnails.
I might also mention I have NGG running beautifully on 3 other sites all using GoDaddy servers. This is the only one using WP 3.3.1 AND the only one with the problem. It works fine on WP 3.3.0 without increasing the memory limit and using the exact same images.
Does anyone know why the latest WP update would have broken NGG?
