Hi Robin,
There is a small misleading error in the comments of the demo for the sizers (Sizers.py)
it says:
rows, cols, hgap, vgap
and it should be
rows, cols, vgap, hgap
I know this is a tiny detail but still…
I’ve attached a patch… 
I know it is simpler for you to do a search replace but I try to get used to “the proper way” 
Peter
gap_fix.patch (1.85 KB)
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