What's wrong? Paste Failed error 0x80070002 when trying to duplicate/create access rules Forefront TMG 2010

I'm trying to copy an existing access rule and paste it as a new rule for a new user, but Forefront TMG keeps erroring out with 0x80070002 

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Mind you, copy-pasting a rule ALWAYS worked before and haven't had any issues until now. 

Also, when I try creating the rule from scratch, it will error out with the same code.

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Anyone know what's wrong? I was told to forward this question/issue to this forum section. The original thread is here: Paste Failed 0x80070002