one of our users changed a posted series appointment in webaccess and selected "this instance" when posting. This resulted in all (and with all I mean all appointments the user can edit - posted and sent) being changed in terms of subject and time.
*Do NOT try to verify if you have the problem on a production (your own) mailbox*
We opened a SR and Novell was really quick on fixing it (Thanks!).
With Build 116395 (and most likely newer) the bug is fixed and only the selected instance is changed, nothing else. If you have the problem, open a SR and request this build.

Just a heads up to all GW Admin out there who are on GW 2014 Webaccess.