child of child category

[gigiograndi]

Hy everybody

I've a really strange problem from a few days: I can't add a child of child category, as Ive ever done last days. For example: I add a new category MERCEDES, a child category C250 CDI 2007, bu i can't add the second level child category as any part of the auto.

I've added already many child of child category in the last days and everyone works fine, but, since the start of this week every time tha i?ve tried to add a child of a child, (backend mode, naturally) in the tree of categories the child of a child doesn't appear and NO errors of ANY kind appears in the control panel.

Could You help me?

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VM 2.26d
VM aio installed