Updates completely messing-up WordPress install(s)

Unable to use the Sucuri scanner on wordpress at all since the latest batch of updates. Loads of different themes, plugins over 80 sites.
Loads of errors which started with the last login updates which started showing rubbish characters… since then its caused complete crashing of the sites and had to be removed via deleting the plugin folder via FTP.

This has happened to over 80 sites I am aware of, 25 of which I have control of which have a varying degree of other plugins.

Thank you for your use in the past but these updates were poorly executed and the sites cannot withstand so many updates with errors. Uninstalled and not-recommending.

http://wordpress.org/plugins/sucuri-scanner/