proc_open() has been disabled for security reasons in /home/ahbekker/public_html/drupal/includes/image.imagemagick.inc

Sorry I have no idea what is happening here, I have a dozen drupal sites using imagepicker, all up to date and all working. I suspect that this is related to a non-drupal update.

proc_open() has been disabled for security reasons is most likely a PHP error set somewhere in your php.ini or something else.

I'm getting the same error and looking into it.

If you have PHP running in safe mode, this function will be disabled.

Here's a list of functions disabled by safe mode.
http://us2.php.net/manual/en/features.safe-mode.functions.php

As per my phpinfo() my PHP is not running in safe mode...but if I look in "disable_functions" i have proc_open in there...so I'll need to fix that.

changes are your php.ini has this line.

disable_functions = exec,system,dl,passthru,chown,shell_exec,popen,proc_open

Looks like you have sussed it :-)