@Jan I posted in the review section, because I believe it is essential that potential users will know that this plugin could wreak havoc on their site. Something that may be out of their reach to solve.
Mine at that point was, in fact, a review, not a request for assistance.
By the way, I notified of the issue three weeks ago.
I'm using an other plugin now, but for what I remember it was the only plugin activated. I made few tests, in local and online, and on a fresh installation of WordPress 3.6 (multisite enabled).
There was no way to get a debug message defining WP_DEBUG, 'cos the site just went blank. It became also impossible to access to the Admin area. The only solution I found was to delete the plugin via FTP (or rename its folder).
Thank you for a free plugin, but if it can potentially cause this kind of issue, I would recommend a fix as soon as possible. Or provide a clear way to get out of troubles for the ones who may fall.