WordPress does not start anymore
What does this mean? You saw only a blank page? No error messages?
It is hard to say what happened without any error message or further details. It could be a lot of things. But it is no default behaviour of 8.8.10.12.
Maybe the installation process was not complete. Maybe a time or memory limit (e.g. max_execution_time, max_input_time or memory_limit) has been reached.
If you have used the automatic plugin upgrade then maybe try to upgrade via FTP (download the .zip file from www.ads-software.com, extract all files and folder, connect via FTP, erase the old files and folders, upload the new files and folders).
(Or try the automatic upgrade again.)
However, if this problem occurs again then please try to find out as much as possible. One important thing you could do is to add this
define('WP_DEBUG', true);
line to the wp-config.php file while the problem occurs. It will force the blog to print out all error message which may exist. (You can read more about the debug constants here and here)
Please, try this. Maybe we can figure out what is wrong.
Thanks,
Tim