Hi and thanks for your help

I assure you that is not anna pplication or driver problem. The guest has not been moified since 12 months and the problem is born just some days ago.

The flow is:

I have VMA: a win2012r2 VM

I clone it and it I create VMB than do not boot correctly

I boot VMB in safe mode

I shutdown VMB

I boot VMB and it works!

then I tried to:

boot VMA and it do not boot correctly

I boot VMA in safe mode

I shutdown VMA

I boot VMA and it works

I shutdown VMA

I clone VMA and it I create VMC than do not boot correctly

It's really strange