It seems that VGA playground uses active high for H- and V-sync

[xzores]

It seems that VGA playground uses active high for H- and V-sync, which would not be correct, according to http://www.tinyvga.com/vga-timing/640x480@60Hz

[urish]

Thanks for reporting! Is this related to #15 ?

[xzores]

It is not the cause no.