It is evident that the Labour Party does indeed have "a problem with antisemitism". What is less clear is whether there is actually any significant antisemitism there, or whether what the problem is that there has been a successful effort by enemies of the Labour Party (including a minority who oppose the move away from New Labour towards democratic socialism), together with the media, to present Labour in that light.

I've looked for actual evidence in press coverage, and I haven't been able to see it. The trouble is that denying it's existence is interpreted as the kind of protesting-too-much that serves to confirm a charge - so instead the strategy of "accepting it and dealing with it" has been adopted.