Disabling numlock allows me to enter answers into the grid.
Briefly, in main.py:~870 (|puzzle_key_event|), the first line is:
if (event.state & ~gtk.gdk.LOCK_MASK) != 0: return False
I haven't looked too deeply as to why/how to fix, but this conditional is |True| (so the input is not handled) when numlock is on. Not familiar enough to know why they would want to trap input when numlock is on. Guessing that's not the intention or that if it is, it's spurious. Capslock did not interfere, only numlock.
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