Sweet Home 3D Freezes

[lasithmp]

Hi I created the ground floor of my sample house. Then I created the upper level of the house. And when I tried to move the staircase of the ground floor while on the upper level, in which the screen frozed for a long time. But now when I try to open "sweet home3D" it opens up three pages of sweet home3D, But it gets stucked as soon as I try to edit anything. My original creation was around 63MB when it was saved last(only the ground floor) I have created only the walls on the upper level(second floor)

I installed the Java-7(update:5) as per the FAQ, but no change cannot do anything. I re-installed "sweet home3D" but it automatically opens the earlier creation that I made(in which freezes as soon as try to edit or do anything)

Appreciate yr earlist help with this regard,
Lasithmp

[Puybaret]

What version of Sweet Home 3D do you use? The installer version or the Java Web Start version?