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In Jigsaw Solo, block boundaries aren't convex, so it's possible for one of them to have an inward corner. If that corner is in the top left of a selectable cell, and you right-click that cell to display the pencil-mode 'cursor' in the form of a triangle in the top left, then the cursor was accidentally drawn on top of the block boundary, where it ought to be underneath it. For example, in game id 5j:d1d4_4c3_1d2d,bb_baaa_dca_baaba, right- clicking in the bottom right square of the grid demonstrates the problem. Jonas Kölker fixed this for Keen in 2015, in commit 6482ed0e3c886af. This is the identical fix, in Solo's very similar-looking drawing routine. I feel embarrassed to have taken eight years to get round to it!
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.