Powershell reports that AD group doesn't exist (but it does)

Starting about two weeks ago, my Powershell script to verify that groups exist before attempting to add a user to them has started reporting that a particular group does not exist, even though it does. 
It's not a new group, it doesn't have a horrific number of members, it's set up the same way as similar groups, has been around for a long time, has the same properties as similar groups, it's not disabled, etc.  From the AD side I can see absolutely
nothing wrong.  I can add users to it with no problem.  And yet Get-ADGroup insists that it doesn't exist.
I know this isn't a Powershell failure because it's accurately finding every other group.  It's just this particular one. 
I did notify our "AD guy" but he hasn't had time to look into it.  I'm hoping that I can get a jump-start on identifying and thus fixing the problem by posting this question.
I apologize for the lack of detail - I'll be happy to provide more info if I know what you need!

Does this happen from all computers running powershell or just one? Are you using the full dn when referencing the group
Regards,
Denis Cooper
MCITP EA - MCT
Help keep the forums tidy, if this has helped please mark it as an answer
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It is happening to any user on any computer.  We're not using the full dn - the cmdlet used is "get-adgroup 'admin-mke'.  Interestingly though, when I tried the dn instead, it does find the group:  get-adgroup -identity 'cn=admin-mke,ou=exchange
groups,dc=na,dc=qb,dc=llp'.
Does that suggest that it IS a Powershell issue after all?  It's just strange because it used to work, and all the other groups can be found with the simpler cmdlet.

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