So, changing the affiliate setting to "Kobo" did the trick. The only problem is, the selection behavior is not what I expected to be and is actually less convenient than it was! The definition directly pops up only if you select a word by using the automatic selection (long press a word), but this doesn't work with japanese, you have to select a word manually, and then the definition doesn't pop up, but what's worse is that in that situation you can never bring the pop-up by clicking somewhere else on the page, be it near chapter starts/ends or anywhere else! So it actually is a step back in my use. I'll try to revert to the version I was previously using. Thanks for the help anyway
