Not Exactly a bug with the reader.

[otoshi-god]

Not Exactly a bug but for me, it doesn't work the scroll down with the down key and 'S', it scrolls a little but then it freezes and i have to release the key and press it again to scroll down more.
it happens too with the scroll up with the up Key and the 'W' key.

 

[Garo64]

not sure if its related

But when using scroll in the reader to go to the next page its not always working also when clicking the image it tends to randomly go the previous page or the next one.

 

[GoldenFury]

I have the same issue