My wordpress default uploader show the http error when upload an image.
I have wordpress 3.0.1 with Cumulus Theme.
I have tried many things and I can tell that the problem is caused by plugins.
I have the plugins:
Admin Trim Interface - 1.1
All in One SEO Pack - 22.214.171.124
Category Redirect -1.1
Contact Form 7 - 2.4.1
Google Analytics for WordPress - 4.0.9
Google XML Sitemaps - 3.2.4
Lightbox 2 - 2.9.2
Lock Out - 1.1
MapPress Easy Google Maps - 1.6.2
I've tried lot of convinations, you can see in the image:
D = Disabled plugin
A = Active plugin
NO/RED = It doesn't work
YES = It works
GREY = I think that those plugins cause the error but there's some problem with the other plugins.
I've tried other Contact forms instead of Contact Form 7 and it doesn't work.