[Plugin: WordPress HTTPS (SSL)] Call to off-site API hangs on WordPress HTTPS Version 3.0.4

This error may have existed before updating to WordPress 3.4 because I stupidly updated both WP and WP-HTTPS at the same time. However, with WP3.4 installed, reverting back to WP HTTPS version 3.0.3 fixed the error.

Specifics: Using Tribulant’s Shopping Cart plugin, shipping quote API call hangs. If SSL is deactivated the process works normally.

http://ww.wp.xz.cn/extend/plugins/wordpress-https/