Articles on Android are unreadable due black box


All of the sudden (for past few weeks) basically all articles / posts I read with NB on Android are shown (rendered) with a black box beneath and text rendering messy. This makes reading articles on Android (OP5 with Pie) basically impossible. On web (using Chrome) everything is just fine.

See attached screenshot for clarification.

Here is another sample just showing black box, no text / images at all…

See existing topic: