Hi,
I got the same problem and ended up debugging the code.
On my end it was the script trying to delete object-cache.php from wp-content folder and failing while trying to enable on first run (wich does a disable due to the bug on first click).
so I would suggest creating that file (object-cache.php) as empty in wp-content and clicking once to make the script setup the option properly and then clicking again to enable it.
hope this helps.
