It looks like you have gone through the steps correctly to delete the cache file. I'm curious if you also tried deleting your configuration folder to see if there is some corruption issue occurring here? Please take a look at this post with the details on making this delete. If you have already done this or get the same result after trying please let us know and we will open a ticket for you to help resolve this.
Delete Configuration
showpost.php?p=12293&postcount=2