Font Color in Android App

Has anyone encountered the problem with the font color on the Android App?
Since about 3 days ago the color of the text is black on the grey background (or any background for that matter). Only the option with brown background works, but the font color changes from white to black and vice versa about 5 times in a second.

Is it a bug or am I supposed to change something?
Re-installation didn't help.
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