I knew this is old topic and I found a lot of related topic.
But...No measures can solve the problem I encountered.
I installed VX2.4 on my laptop with win7 sp1 x64.
at first I reinstall VX when I encounter this problem, then I can open previous project, This situation can last for some time.
but now the time became very short, I'm going to break down
actually I tried to properly close VX every time, but this problem still often occurred.
I do not what action lead to this problem