If the last version of UltiMaker Cura you used was 4.x - Things have changed a lot for you.
I would recommend reading about the (too many to list here) changes on the knowledge base.
See: https://support.ultimaker.com/s/topic/0TO5b000000Q4xhGAC/cura-5
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Slashee_the_Cow 409
Awww, I had this one come up a while ago and I can't remember how I fixed it.
Just made a quick test, try turning on Walls > Print Thin Walls to start.
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