[Plugin: NextGEN Gallery] Problems with uploading/upgrade

I have been using this marvelous plugin for a year now. A lot. Suddenly, I tried to upload pix to a new gallery. They seemed to be uploading, but instead of creating thumbs, after a long pause the screen filled with lots of code. The pix did in fact load, but there are no thumbs. I have to do each individually.

I tried to upgrade my version of NextGen (I’ve got, like, 1.4.3 blush) but when I tried to upgrade, I got the following msg

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 744339 bytes) in /mysite/wp-includes/http.php on line 1363

I don’t exactly have a lot of addons. I have got a lot of pix. To what does this allocation refer? And any idea about that screen full of code? (Sorry…I didn’t take a screenshot.)

http://wordpress.org/extend/plugins/nextgen-gallery/