This problem started a couple of months ago.
We have the Advanced Attachments and Custom Fields add ons.
Every so often, maybe one week, maybe two the following happens.
Both add ons show up as not being registered and I have to enter the activation code again which seems to activate them fine.
At the same time the links to 'some' but rarely all of the forums and individual posts revert to using the IP address and effectively break the system as users get warning messages in their browsers about the site being insecure.
Deleting the Cache resolves the address issues.
The two seem to be linked so can you please advise what I can do to stop this happening?
Thanks
David