So...!
After poking around with Reggie and Medwyn, it's been a real chore trying to pinpoint what the exact issue is since my update didn't seem to correct the issue, BUT... a likely culprit might be something I did back in 1.103's update in regards to how Ren'Py archives files.
I seems likely that saves from 1.103 and 1.104 might break (and they might work! It's hit and miss...) due to what I did then. The update I ran earlier today in an attempt to fix the problem might very well have fixed the issue.
BUUUUT....
This also means that folks might have to start their file over again if they can't load correctly. It's really hard to figure this out or even test for it since it seems to be so random with who's encountering it and who's not, and when it's happening.
For best results, I'd start fresh files on 1.105 (the one I uploaded earlier today) and keep several saves throughout the play.
I won't really know if this is a guaranteed fix just yet, so if anyone downloads 1.105 and plays through to the end and finds success (or failure) with saving/restarting/loading... let me know! Otherwise, I might not know more until I launch 1.106 and see what happens with saves there.
Again, I'm sorry for an inconvenience, folks!
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There appears to be some other problem with save files crashing. It doesn't happen for me when I do my usual testing, but if I play from the builds I create, the crashes occur.
It's just not happening on every file though, so it's making it harder to figure what's causing it.
Not everyone will experience this either. When I started my Darius route over for testing, I saved several times along the way, and 3/5 of my files don't load now VIA the stand-alone build (but they work fine from my Ren'Py launcher), and they are from various places through his route.Until we can figure out what's causing this, I really suggest having several save points for each character just in case (you have plenty of save slots for it!)
Please keep in mind, this is still a work in progress, and hiccups like this should be expected, especially when there are major overhauls. I'm really sorry about the inconveniences.