Just updated and it breaks subsites admins areas

Hi all,

We were just told by the WPMUDEV dashboard whatsit that there is a new version of the Global Site Search so we updated.

Post update, when visiting the admin of a subsite we just get a white screen.....

As such, we have had to disable it for now.

Is there a fix on the way? If it's not likely to be fixed today how do we downgrade so the dahsboard still controls the upgrade process?