One last thing, I notice jumps in the newer Constructs are a lot more floaty.
The old Gravity value was split into three different values, Jump Gravity, Jump Sustain Gravity, and Fall Gravity. You will need to update all of your platform object's settings in order to compensate for the new features.
Remember that this could likely be a problem all the way up until the v1.0 release. It's unfortunate, but just hang in there. Just remember the old mantra... "Construct is in beta." Anything that you see here today might be different tomorrow and it could very well break any project you're working on. The devs try not to introduce any new game-breaking changes, but sometimes it's unavoidable. That's the risk you take when you beta-test software, and that's why I've personally put off any big projects until after the v1.0 launch.
And make no mistake... whether everyone realizes it or not, we are all beta testers. We're the front-line soldiers. We're the guys that get shot to ribbons while storming the beach. No guts, no glory!