VirtualBox discard all snapshots

I use VB for classcomputers and now I am going crazy?

Until recently (before upgrading VB) after a class I used a commandline:
VBoxManage snapshot "IMAGE" discardcurrent -all.

Then everything was back to how it was before the class. Now it does not seem to work. I do NOT want to merge the snapshot I want to return to no snapshot without merging. I have Googled my ass of for this. Why is it so difficult??

I am in a hurry so therefore I give this one 500!
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hke72Author Commented:
Now I found I could restore first and then delete to get the same effect, but VBoxManage does not work with snapshot delete!?
So that is now the problem. To use VBoxManage to delete the snapshot without error.

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hke72Author Commented:
After upgrading to 3.1.6 it worked again!
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