[eluser]OverZealous[/eluser]
OK, I fixed the Production Cache issue. You can't use var_export to export a stdClass, because the stdClass doesn't know how to re-import the data later.
So, I changed $_field_tracking to an array, which works.
If you need the cache functionality, just re-download the 1.7.0-RC1 lite file, replace the library, and clear your cache again. If you don't, then no worries until I release the final version.