Fill Selection and Limit To layer in Fill-mode are represented by two apparently "checked" options.
However the cross represents "off", it's not apparent that these have a tick-option, so the first impression is that these are active.
Similar issues with "Lock aspect ratio" for Gaussian Blur filter.
Perhaps a less bold interior to the checkbox for inactive would be worth investigating? (Theming support probably helps here...could always leave and test an alternative theme with users)
Git commit 49dca875ddce6cdf20f39324dc46c22188be55d7 by Arjen Hiemstra.
Committed on 21/05/2014 at 15:35.
Pushed by ahiemstra into branch 'master'.
sketch: Use a lighter colour for the x in the unchecked checkbox
This should help make it clearer that an unchecked checkbox is, in fact,
M +2 -2 krita/sketch/qml/components/CheckBox.qml
A +194 -0 krita/sketch/themes/default/icons/checkbox-checked.svg
A +13 -0 krita/sketch/themes/default/icons/checkbox-unchecked.svg