I am still having problems with corrupted projects (I tend to add and remove families/private variables/stuff and then run into strange bugs).
0.99.9 is still not the most stable in that regard, however it is miles better than the current stable release.
Yeah, I'm in the same boat as you are. Corrupted projects are still happening for me as well with this version. Some odd, and seemingly unreplicatable bugs show up within the editor itself, and the project is never the same again. As in, writing the same exact script, line for line, in a new project seems to work as intended, whereas something or other will go wrong with the old project.
Sometimes it's not even a runtime issue. My favorite one today involved construct.exe crashing every time I attempted to change the font in any Text object in a particular layout. Other layouts in the same project, no problem. Opening Construct again, still the same problem. I ended up copying the Text object to a different layout, changing the font there, and pasting a clone of itself into the first layout. Still, a lot of needless work for something like that.
And every version I've tried seems to have the same intermittent bugs with the Animator window, wherein clicking on the animation name will sometimes work just fine, sometimes do nothing at all, and sometimes crash the program.
So, yeah. This version isn't stable, nor is the previous "stable" version, nor the couple of versions in-between. But if we're using the "stable" version as our benchmark, 0.99.90 is as good as any.
I don't mean to sound especially negative or disparaging, but it does get a little frustrating. I keep hoping the existing bugs will get fixed before new functionality is added, but most of the time the bugs that are squashed aren't at all related to things I use.