I spent alot of time researching this and all I could find in this forum was people running RedHat 8 having this issue and all they had to do is change their php.conf file setting. Unfortunately that doesn't help me because I'm running Gentoo and there is no php.conf file. :-p I also tried increasing the php.ini file setting for upload_max_filesize and post_max_size and that didn't help aswell. I did finally figure it out and fix it. What I found to be the problem was the 70_mod_php.conf file located in my /etc/apache2/conf/modules.d directory. In that file you'll see about 3 entries of code with "LimitRequestBody" set to 524288 which is what limits you. Just add a few zeros to each of those and restart apache2 and you're good to go
I just thought I'd post this because of the amount of time I spent trying to figure it out. I hope others can benefit from my time aswell.
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Gallery/webserver Gallery v1.4.3 on Apache 2.0.49
PHP Version 4.3.6
Apache version: 2.0.49
Operating system: Gentoo Linux
Posts: 13451
Would you mind adding this as a note to the approproate section of the docs at http://gallery.sf.net/docs.php? Thanks!