Hi Freek,
The EyeX for Windows team have looked into this, and it seems there is a bug in Chrome related to event handling. A bug report has been filed to Chrome, and in the meantime, we are trying to find a work-around.
The developer preview of EyeX for Windows is a pre-beta version of the software to be released later this year, so we appreciate bug reports to help us stabilize the software before the official release.