I am getting this error after migrating the site to a new server:
Notice: unserialize() [function.unserialize]: Error at offset 2 of 23 bytes in includes/bootstrap.inc on line 478
I'm sure somewhere a setting has been corrupted; however, the site does appear to be functioning correctly. This error does return inconsistently, for anonymous users, so I do need to take care of it.
The error does not occur on the old server.
I have full control of the server, both the new and the old are Amazon EC2 VMs. The only major difference in the infrastructure is that the old server used a MySQL DB in the same VM, while the new server is using a MySQL Server in RBS.
I've read somewhere that this issue could be caused by the SQL export/import process, and something regarding UTF8. I wasn't able to garner anything I could mold into instructions to follow, but I have a feeling that's a path I need to take; I'm not really sure where to start.