I wasn’t expecting to have to do this already, but when an error is found, I try to fix it as soon as I can.
Case in point: I discovered a bug in Blocks that wouldn’t allow you to create a new level if you had previously opened a level without closing it first. That’s not supposed to happen; you are supposed to be able to both open existing levels and make new ones without having to relaunch.
This bug has been patched in Blocks 0.9.1, the very first bug-fix release. As I planned, the level name display visually tells you if a new level is being created or not. If the display is blank, then a new level is being created.
Just like usual (and you should have memorized this by now :P), you can download Blocks 0.9.1 from GitHub. Have fun!