OK, I think I have figured out whats wrong. I think the problem is your positioning of the mini on the breadboard. If you do that as you have the middle pins (between the two rows on the edges) connect (unlike real life I expect) to the pins on the breadboard shorting some of the pins to each other. That likely causes database corruption and causes the part to disappear as a side effect. The solution is to move the mini down the breadboard so the pins don't short. With the mini as originally set on the breadboard gnd is shorted to +5V via the right side middle gnd and +5V pins (which connect to the 5 pins all bussed together on the breadboard). I expect in real life there aren't pins there and there isn't a problem, but fritzing makes the connection if the pins are on top of each other and that likely causes the problem. To solve that I moved the mini to the end of the breadboard so the extra 6 pins hang over the bb area that has no connectors so they won't short. I also used the power strips on the bottom to distribute power and ground although direct connections will work the same in practice. Now it appears to load and save correctly (at least for me on Windows Image may be NSFW.
Clik here to view.
). As a side issue, I think your connections to the battery charger are incorrect (I'm not sure mine are any better though, you need to look over the documentation for it Image may be NSFW.
Clik here to view. ). As well I think the display may be 3.3V only and thus may need level translators to and from the 5V signals on the mini (or a 3.3.V mini and a 3.3V output battery charger) again check the documentation (Adafruit's is usually excellent!) to see if it is 5 volt tolerant (many displays are not!). Hope this helps!
arduino_pro_mini_problem_fixed.fzz (18.2 KB)
Peter
