8 data pins + RW 432 milliseconds8 data pins - RW 641 milliseconds4 data pins + RW 719 milliseconds4 data pins - RW 1038 milliseconds
... seems to work, as does the main site.
It seems to me you have a bus issue ...
The one bug I am aware of is that autoscroll() on a 40x4 LCD only scrolls 2 lines despite my best efforts.
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via Egeo 16