This may be just KDE issue, but here it is. Usually I have several windows opened (browser, etc.) and usually they’re maximized. But when I switch to e.g. browser from synfig then use alt tab, to bring synfig back, the docks staying under browser. Docks aren’t on the taskbar nor in alt-tab list so the only choice I have is to switch back to browser and minimize it. The best fix would be to bring all docks to front whenever main window or one of animation windows is activated.
If this is in 0.63, then sorry for bothering you, I use 0.62.02.