incompatible with ubuntu 20.10

[rmtk]

I upgraded system from Ubuntu 20.04 to 20.10, and then I found XnviewMP freezed when I opened settings-catalog and some strange color blocks appeared on screen.

Screenshot at 2020-11-05 18-34-26.png

terminal said:
libpng warning: iCCP: known incorrect sRGB profile
QMetaObject::connectSlotsByName: No matching signal for on_pbDelThumb_clicked()
Please investigate it.

[xnview]

no problem elsewhere?

[rmtk]

For 0.98.2 it's worse, application freezes as long as I click the catalog button. I can't even see the catalog page.

terminal messages:
QMetaObject::connectSlotsByName: No matching signal for on_pbDelThumb_clicked()
QMetaObject::connectSlotsByName: No matching signal for on_pbOptimize_clicked()

[xnview]

Strange, i have no problem on ubuntu 20

[rmtk]

Finnally I figured out the reason. There was a line
cacheList=@ByteArray(\0\0\0\xff\0\0\0\0\0\0\0\x1\0\0\0\0\0\0\0\0\x1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x10\x1\xbf\0\0\0\x3\x1\x1\0\x1\0\0\0\0\0\0\0\0\0\0\0\0\x64\xff\xff\xff\xff\0\0\0\x81\0\0\0\0\0\0\0\x3\0\0\x1m\0\0\0\x1\0\0\0\0\0\0\0S\0\0\0\x1\0\0\0\0\0\xf\xff\xff\0\0\0\x1\0\0\0\0\0\0\x3\xe8\0\0\xf\xff\xff)
in xnview.ini, as long as I delete this line the problem is gone.
But it's strange that version 0.96.4 or older is not affected.