I also have gotten a strange error since the last version, that sometimes when I use the select color tool and click on a color in the pallet, that it highlights the correct pixels, and then when I release the mouse button the selection shifts over to the left. But again, that's not consistent so I don't know that there's enough info for you to look into that yet.
Clarification on magic wand. If I click and release on a single pixel it doesn't select on release. If I click, hold, and then drag over one pixel the selection will happen on release, so as long as I'm dragging into the already highlighted area works as expected. Otherwise it will add to the magic wand selection, which is desired behavior.
I thought shortcuts were broken, but I was holding down Command key instead of CTRL since that's how adobe handles on osx, so user error on my part.
Is there a new download link for the fixed version or are you working on a newer version now?