Unserialized Theme Variables and PHP Warning: array_merge Messages

I was receiving the following two errors and I thought taht they were related, but I had no idea how to approach solving them. =(

This first error seems happens intermittently when I load a page from a view and appears on the page when loaded and it has also appeared the admin modules page even though I have error displays off.

Notice: unserialize(): Error at offset 541 of 661 bytes in variable_initialize() (line 1174 of /includes/

line 1174 is as follows: