Re #1: check the scribbling color. The color selection is weird sometimes.
It happen to me too
To see if that is the problem at the end of the sequence described at #1 try to change the color (select black again even if it shows it is selected). You will have the surprise to see that your scribbles are there, they are just drawn in white.
The finest pen seems to have a bug. Luckily I do not use that
Most of the bugs and suggestions you mentioned above have been described here or in the thread "Reading technical PDFs"....
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