Blobs all over preview in 4.1

[Ayres3D]

I've noticed on the last few prints which I've sliced that I'm seeing weird blobs on the preview (see attached). I can't see that this reflects an actual expected print?

I have included the factory file which generated this too.

Base.factory

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I just hope it's not contagious as it looks nasty and I have lots of other factory files nearby!

[wirlybird]

Those could be retraction points. On the preview screen look to the left about half way down and there are check boxes for thing to be displayed. Uncheck some of them and see if things change.

[Raise3D Pro Plus 2]

Right only preview.

[Ayres3D]

Ah.... You're absolutely right, of course. I must have enabled that by accident and, having never switched it on before, had no idea what it was.

Thank you for your help