Running with Joomla 2.5.7 and Warp 6.2.6 - no issues so far.
Not floating in IE 8.0.7600 when AFM Vertical movement option is set to 'Center".
Nice work sir.
Thank you very much for your kind review!
Please download the latest version of the module, there were fixes regarding centered positioning.
If you still have issues, please don't hesitate to contact support through the link on the site.