The loss was generated by re-valuation of MANU's deferred tax asset (DTA), something any company that pays tax in the US is going through now due to the change in the corporate tax rate from 36% to 21%. The DTA is basically an excess payment of of tax that will ultimately be returned, like a tax shield. It's worth more when tax rates are high and worth less when tax rates are low. When tax rates are suddenly lowered, the value of the DTA is remeasured, and companies have to write down its calculated value and take a non-cash charge to earnings. That's what happened to MANU -- the charge was large enough to wipe away the earnings and create a loss for the quarter. In income before the charge terms, profit before tax was down slightly vs. last year's quarter.
So it's a loss, but a one-time loss, and a non-cash, non-operating one, and all other companies with US ops are also taking the same revaluation, so it's no big deal.
All of this is boring and none of this changes the fact that they continue to be scum. In fact, the scum before tax margin was up 3,549,097% this quarter.