I've tried to upload it on different browsers, and different computers, but it gives me this same error every time, after putting in a captcha. Any way to help this get through?

ArgumentError in PostController#create

/home/e621/e621-production/release-2014-06-08/vendor/image_size.rb:257:in Integer': invalid value for Integer: "0b" RAILS_ROOT: /home/e621/e621-production/release-2014-06-08 Application Trace | Framework Trace | Full Trace /home/e621/e621-production/release-2014-06-08/vendor/image_size.rb:78:in initialize'
/home/e621/e621-production/release-2014-06-08/vendor/image_size.rb:257:in measure_SWF' (eval):1:in initialize'
/home/e621/e621-production/release-2014-06-08/app/models/post/file_methods.rb:155:in eval' /home/e621/e621-production/release-2014-06-08/app/models/post/file_methods.rb:155:in new'
/home/e621/e621-production/release-2014-06-08/app/models/post/file_methods.rb:155:in determine_content_type' /home/e621/e621-production/release-2014-06-08/app/controllers/post_controller.rb:59:in create'

Request

Parameters:

{"authenticity_token"=>"7Pil0y9IVWB93aHjMHHQqjsWexb63rD9i9GMAvCtmWY=",
"post"=>{"tags"=>"rape castration flash anal penectomy cbt male gay torture domination snuff fellatio forced_oral sex cum cum_in_ass cum_on_face game text penis masturbation humiliation nullification ",
"description"=>"",
"parent_id"=>"",
"source"=>"http://www.furaffinity.net/user/tastelesswolf/",
"file"=>#<File:/tmp/RackMultipart20150305-1640-1d3bjnq-0>,
"rating"=>"Explicit"},
"__cf_waf_tk__"=>"058604008TOIaHcrCGe-EYfYhNZM4G6StumU"}

Show session dump
Response

Headers:

{"Set-Cookie"=>"blacklisted_tags=scat&f%C3%A6ces&macro&micro&balloon&rating%3Asafe&my_little_pony&score%3Asafe&my_little_pony&friendship_is_magic; path=/\nblacklist_avatars=true; path=/\nblacklist_users=false; path=/",
"Content-Type"=>"",
"Cache-Control"=>"no-cache"}

im not a master at this stuff but i think that you should wait some time and try again later?

Have you tried turning it on and off?
sorry I'm not helping