1.5.0 - viewer - High zoom quality - None still affects image

[xnview]

Thanks to your detailed description I can reproduce the problem.

[xnview]

This problem is supposed to be fixed in XnView MP 1.7.0. Please check and confirm the bug fix here.

[user0]

fixed in 170

UPD
186
it looks like Zoom-in/out:None (in Settings) still affects zoomed-in/out image with enabled 'High zoom quality' at certain conditions,
eg multiple tabs opened or multiple instances are opened

related:
1.8.0 - viewer - High zoom quality - few issues (B)