When opening Marked 3 to existing tabs, I consistently face "Unable to generate preview" errors to the point they have become a burden in time to set right. I typically open numerous tabs at once, e.g. 12, and on average, when Marked closes and reopens, each tab show "Unable to generate preview" followed by a description of how to fix it. (I mean: 12 tabs, 12 fixes required) Is this a known problem with Marked 3.O.30? I am running the Marked version purchased from the App Store.