I have a strange problem for about a week. I have 3 input languages enabled on my smartphone (EN, RU, DE). To switch between them, I usually could slide the space-bar of the on-screen keyboard to the left or to the right.
However, recently this function has suddenly disappeared. The triangles do not appear on the space bar. I've found a few other posts on the internet, and there the authors connect it to the 4.3 Android upgrade. I am not sure though. I thought I upgraded quite a while ago and everything was OK. But I may be wrong.
Interestingly, if I switch to the hand-writing mode by tapping the "T"-button to the left from the space bar, the triangles appear on the space bar and I can now switch the language.