Has this issue been identified? I have had it happen to me as well.
I am using 1.0.12, but wanting to upgrade my Joomla to 1.0.13.
In the admin of Joomla 1.0.12, I updated some SEFs and canceled
the requests to make a 301 redirects.
Soon after, my site went blank with the same T_STRING error in this thread.
I dropped the database and recovered, from nightly backup, to get my site
back on-line. I did not try the cache turn on/off solution as I want all to
work completely.
Thank you for your time and consideration. This is the greatest Joomla SEO component on the market.
Best Regards,
Wes