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Small but somewhat annoying issue:
On the windows version 0.26 & 0.27 the layers panel will sometimes get very wide and take a large portion of the monitor width. Any attempts to drag it to a smaller size fail.
For me on 0.26, when I start new Klayout window everything is OK, but if I load another design to a new panel then the layers panel becomes wide and is stuck at this wide size. Even if I close the additional panel it would not get smaller afterwards.
A peer of mine just installed 0.27 and it is starting a s a wide Layers panel to begin with.