ZZ9000 flicker fixer image quality problem on Amiga 2000

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  • Amiga model: Amiga 2000 r6.2,
  • 680x0 CPU: 68030
  • RAM Configuration: 128MB + 1MB
  • Kickstart, AmigaOS Versions: KS 47.111, WB
  • ZZ9000 Firmware version: all public available tested
  • ZZ9000 Driver version: as needed for the firmware
  • Monitor model: Dell U2412M and other
  • Other Zorro cards: Olga, Oktagon 2008 (and with both removed)

Long story short:
Amiga 2000 r6.2, KS 47.111, WB
Olga 68030 (128MB)
Oktagon 2008 (8MB configured for 6MB because ZZ9000 want at least 2)
Dell U2412M DVI-input with HDMI-adapter
ZZ9000 card(s) have been over-voltage-patched (by Chucky)

Every other vertical line is piggy-pink, elephant-blue or red on the scandoubled Amiga RGB screenmodes. If I grab the window with the preferences applications (as in provided images) and moves it one pixel to either side the piggy-pink disappears from the piggie-pink icons.

I have isolated this to have happening after ZZ9000 firmware version 1.3c (starting from ZZ9000 firmware version 1.5.1)

RC1 and up to 1.3c which were the only earlier releases for Z-II works fine.

Not (Amiga) software related, as it can be seen already in Early Startup (since my Oktagon 2008 gives an error there because I’m out of Zorro-II adress space when that is configured for adding 6MB RAM)

What I have tested:
I have tested with both my ZZ9000 cards, I have tested the three most recent versions of the firmware, then from RC1 and up (all versions for ZorroII, so actually only RC1 and 1.3c which are available from the archives) until failure at 1.5.1.
I have tested both video-slot adapters with both ZZ9000, and both the Amiga 2000 and Amiga 500 ribbon cables.
I have tested with another monitor.
I tried to test with my other Amiga 2000, but it wouldn’t boot with the card inserted (r4.3, 68000, ks 1.3)
I’ve also tested with the r6.2 without Olga and other cards (didn’t boot)

So what am I missing out if I have to run the card with firmware 1.3c ?