Loading r293.3 works fine for me. I don't know why there would be a problem loading it - it's loading the same version as you would have previously been using.
We work hard to make sure changes don't break anything. By the time of a stable release most of the changes have also had several weeks of public testing in beta releases, but sometimes things slip through the net. I apologise for any inconvenience with changes in updates, but it's impossible to make any changes to software without some risk of breaking existing things; sometimes mistakes are made and not caught by beta testing. The best thing to do is to report any problems by filing an issue following all the guidelines. It's also very helpful if regular users can at least occasionally try their projects in the latest beta release, and let us know if anything isn't working, so we can make sure any accidental breakages are fixed before the stable release.
I'd add we also have fixed loads of other bugs between r293.3 and r302, so the overall reliability of Construct has definitely improved, and will continue to improve. The longer you stick to an old release the more likely you are to end up stuck on some other issue that we already fixed, so it's best to regard that as a temporary measure and focus on getting your project working in the latest release.