Just upgraded 4.6.9 to 4.7.10 and get the following message: "Sorry an error occurred and your information was not saved" when creating a new mail message.
Click Mailings, New Mail and then enter a mail name. Click the recipients, select my test group and wham the message above is displayed. This message can occur at random in this form and is not specifically related to the recipients selection. No matter what you do it does not send the email or save the record.
Other web hits indicate that you can bypass this security check by enabling the 'CiviCRM: skip IDS check' permission'". Tried this on and off and no joy. This is using the Admin role which should have full access.
Anybody got any clues?