yes, I have size, size2, size3 (which are basically just different types of sizes like XL or 48 and can be merged into 1 column) and product_color. The thing is that that some products only have size variants, others no variants at all, and some size and color variants.
Before I had a csv with only size/size2/size3 variants and a drop down view, and variants displayed ok. The new csv' s gotten second variant product_color for some products.
I'll try to test it out with a corrected csv and come back to you then.