I noticed the lock after updating to r243.
1 - When saving the project. (He has already created and with numerous previous saves)
2 - When exporting the project!
When starting the loading bar, construct 2 hangs, the loading bar is infinite and the software does not respond to any command!
Off only after a Ctrl + Alt + Del.
You will need to follow the 'Bug Report Requirements' if you want Ashley to investigate this, especially as no one else is reporting this.
Does it crash when exporting all projects (one of the installed examples, for instance) or just this particular project?
Are you using non-standard plugins?
What export option are you using?
What OS are you using?
Are you using the image compression and minify options?