I am also using same hardware. For me too not working.
It must have a problem with driver, I think with with dma2d functions.
I have also a problem with gradient, function draw small bar with different colors.
I had the same problem!
If you draw with GUI_DrawLine() it works, but if you use GUI_DrawVLine() or GUI_DrawHLine() it doesn´t work due to some very strange reason
Hope that helps
as stated in the emWin user manual (UM03001_emWin5.pdf chapter 8 '2-D Graphic Library' at the description of SetPensize()) SetPensize does not affect all drawing routines.
These are the routines which are affected:
My bad, I have not read to the end. Thanks.