Hi,
The broken image may be due to missing PHP GD Library in your installation or a previous output being sent from the theme or a third party plugin.
If you can indicate the address of the public page that contains the captcha I can check what is the cause of the corrupted image.
Thank you for using the plugin!
Hi!
Did some debugging myself and it was as you proposed a third-party plugin that was sending a linefeed before the image output started. I disabled that plugin (wp-optimize) for now.
Thanks!
/Erik
Thank you for the feedback!