is it visible without background trasparency?
i am using dolphin+ keyboard but i will try with the standard one, and if is allright i will contact developer to solve this bug/issue.
For me there is no problem in landscape but in portait only.

PS: however thank you coderus, i will send to you a small donation both for help that (always) offer and for powermenu2 (wich i have discovered yesterday and i really find useful)