Thanks to contributions from members of CIS 269 (software maint) class this spring, Logic Gate Simulator 1.4 is now out the door with many interesting new interactions.
This is mostly a performance improvement. Memory leaks have been decreased (though not entirely eliminated), and overall circuit performance has been increased. The threading model has been changed, and visual updates are batched. Some minor glitches have also been resolved. Except the flickering grid thing, which I can't reliably reproduce.
This is a minor change which brings a few usability improvements.
A number of minor improvements, and two major improvements: you can now graph circuits over time using an "oscilloscope" view, and there are a variety of performance improvements, including much more sane thread management.