I'm currently experiencing the WSoD (White Screen of Death) on one of my WP installs and I'm trying to reduce the number of issues that could cause it. I am running a large number of plugins and yours happens to be one of them.
I'm running my local WP install in
mode, this can be added to wp-config.php and I'm turning on 1 plugin at a time.
I have WPML installed on the site at the moment, and I have believe that is possibly the biggest cause of the WSoD. The author started a paid version this month and is no longer releasing free updates. The paid updates could possibly resolve the issue.
I'm investigation new options and trialing your plugin on my local host at the moment. qTranslate looks much lighter so I'm going to see how it goes.
If you could please check your plugin with WP_DEBUG mode on resolve any messages that come up for the next release, this would be amazing.
Thank you for your time and creating a great plugin.