Problem with oil paint (Artisan) cracking

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One of my students brought me a painting today which showed clear cracking in one colour only namely a Payne's Grey. I was assured that the work had been done on an oil/acrylic paper. I should be grateful of any views as I have used Artisan for many years and have not had any such problems nor have others I know who use Artisan. Has the paint been applied to thickly or is it a faulty tube of that colour? Thanks for any help that can be given