Bulk Datetime change on Multisite?

Hey,
is it possible Bulk Datetime Change is not compatible with WP Multisite?

I’ve tried for a few hours changing the upload time of a few uploaded PDF attachment files on a multisite’s main site (blog 1 or in the database wp_posts/wp_postsmeta etc.)

I’ve disabled every other plugin, yet BDTC simply does nothing at all, no matter if I try to change a single attachments upload date or to bulk-change 20 attachments or if I click on any “update” The changes are just displayed, but never written into the database.

Thanks, Phil