I experienced an issue with recurring meetings reverting back to a fixed date/time and learned after meeting with RingCentral Support (Case #07470228) that this is because the Outlook plugin for RC Meetings assumes that when you set up a recurring meeting, you will be setting up a recurring calendar appointment as well. In this particular use case, I wanted to set up a recurring meeting to use with an external group on an ongoing basis, not tied to a regular Outlook appointment.
When I completed the scheduling process and closed out of the Outlook appointment pop-up (because I didn't need it), the recurring meeting appeared in my list of meetings as happening on today's date, beginning on the next hour.
The workaround for this is to uninstall the Outlook plugin. I am now able to schedule recurring meetings the way that I need to, but I have lost all of the features of the plugin.
My suggestion to RingCentral is to allow users to create recurring meetings but skip the Outlook appointment step. Making this a required component of the scheduling process limits the usefulness of the Outlook plugin.