I tried to launch the oldest portable version I own (3.6): it started.
Then, I tried again with the 6.4.2 and now it works again.
Don't know why; but if someone else should have the same problem, this could be a possible workaround to fix it.

Andrea

<t>Hi.<br/>
I use the portable version 6.4.2<br/>
Yesterday I tried to plan a movie, but while it was computing all, my pc froze, so I had to restart it.<br/>
Now it is impossible to start again SW3D: it seems like it starts the app but nothing happens more.<br/>
Reading some posts, i decided to ...