There is an issue when trying to edit or delete a recurring appointment in CRM 7.2F using Chrome.
When editing a recurring appointment in Chrome if you click on the Save or Delete button nothing happens. In Firefox or Internet Explorer a modal dialog is displayed giving you options about saving changes to only the current appointment in the series or all appointments in the series.
You can use IE or Firefox to edit or delete recurring appointments in CRM.
There is also a workaround available from Google which will work up until May 2015: https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/1fgjVZVgUx0
This issue is no longer a problem in Sage CRM 7.2h