Version:            (using Devel)
Installed from:    Compiled sources
OS:                Linux

If we add a train clock to the panel, Plasma thinks it's width is much less than what it is, so first it paints over the plasmoids on its right and left, but if I move the mouse over it, those plasmoids repaint, so the sides of the clocks are cut down.

I can post a screenshot if you cannot reproduce the problem.