I am not sure if this bug was fixed or just hidden from the user.
While in previous versions of skritter you had this bug that happened once or twice a day, now, however, on the new version whenever you want to start a review you have to wait for about 20 seconds until the button becomes clickable. every damn time
even worse the new version introduced a new bug: as soon as you open another app for 1 second in 95% of the cases, skritter forgets its state, this means every time i have to wait 20 seconds for the app too open, 20 seconds for the app to sync, and 20 seconds for it to load the revision selection i clicked before i can start my review. then i do about 15 items until I get a message from a friend, answer on it on accident and damn i can wait again for 60 seconds.
i do not know why this happens, but as it does not happen 100% of the time, i suspect that you might have a memory leak and the skritter app takes so much memory that android just has to through it out if any other even lightweight app is started.
besides that you really need to work on the speed of your app. i do not know any app i use with a startup speed that slow. and it is not like it cannot be done better: you might know wanikani, they do not have an app themselves, but there is a third party app called Flaming Durtles: it is free, made in someones freetime, AND its blazing fast. you never have cache problems and all syncing is done in the background.
As i am paying, to say this respectfully, quite a lot of money for skritter I should be able to expect at least if not a better experience than what a free app offers me.