@epriestley I strictly change my conf file on documentation recommends and restart nginx, but this doesn't help.
Is there any way to load this files from CDN, for example?

@epriestley This is my nginx phabricator config
http://pastebin.com/4SbwPZXg
Is there any way to regenerate pkg files, or view generator logs?

I use nginx, and nginx error.log is empty. I have php 5.6.6 version, and php error log is empty too. I doesn't change any config files and I doesn't update my server software recently.
I can't understand why only pkg file doesn't loading, for example
http://185.25.119.13/res/phabricator/a27580c5/rsrc/css/application/conpherence/durable-column.css - 200OK
http://185.25.119.13/res/phabricator/404f1f98/core.pkg.css - very long loading, and finally ERR_CONTENT_LENGTH_MISMATCH

@chad I was thinking about that too, but after I updated phabricator this problem left unsolved.

I have the same problem. My browser can't load core.pkg.css and core.pkg.js files, it is trying to load it for 30 seconds, and stops loading.
In my acces log file i have just one line about this files
176.36.114.16 - - [24/Mar/2015:20:45:21 +0200] "GET /res/phabricator/cbdbd552/core.pkg.js HTTP/1.1" 200 24320 "-" "Mozilla/5.0 (Linux; Android 4.2.2; 2013023 Build/HM2013023) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36" "-"
I can't reset project to old versions, because my db version doesn't support it. All my team members have this problem.