After enabling Jetpack on this site I started having problems viewing old posts or using the editor toolbar in the admin interface. A few times I received “500 internal server error.”  After some searching I found that I needed to add the following lines to my root .htaccess.

AddType x-mapp-php5 .php

AddHandler x-mapp-php5 .php

Please be sure to add the lines after # END WordPress line otherwise the settings may get wiped out.

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Recently I received an HTTP Error when trying to upload images for a post on this site. This error seems to relate to using 1and1 as a host. The fix is easy, add the line below to your .htaccess file located in the root of your WordPress install. Be sure to add the lines after # END WordPress or your changes may get wiped out.

AddType x-mapp-php5 .php

Here is where I found the answer.

http://wordpress.org/support/topic/http-error-on-image-upload-still

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