Sharepoint foundation 2010 not reading users from ad group correctly

I have a 2008 server running active directory and Sharepoint Foundation with Sql server express 2008.  There are only 80 users in the organization, so everything is on one box.  We have a fairly simple sharepoint site with about 6 sites within it.  We have set each of the sub-sites not to inherit permissions so that we can give access to certain users for those sub-sites.
Thats all straightforward, but here is the odd thing.

Let's say I have a sub-site called "senior managers".  On the permissions for that site I have added the Active directory group called "senior managers".  Within that group I have 4 members.  When those members logon, they cannot get access to the site.  When I check permissions for their users names, Sharepoint says they have no access, even though the group they belong to does have access.

It is as though Sharepoint is not able to read all the users that belong to the AD group.  To make it worse, on some of the other sites, it reads some people, and some it does not.  It does not seem to have a complete update of active directory.  If I create a Sharepoint Group and add the users to that group, it all works.

Any thoughts?  Thanking you all in advance.
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Hi softecsolutions,
I had these problems, too.
Please rerun a full UPS and check the AD Group, too.

Best regards
softecsolutionsAuthor Commented:
Thanks, I will try that, once I have time to look through some documntation on how to run a UPS.  Finding straightforward instructions seems to be difficult so I will need to do some research.  Too full a day today and tomorrow, but I will aim for Thursday and let you know.  Not sure what you mean by check the AD group.
Have a look on some of these Screenshots :)

I mean if the Users are put correctly into a group and that all have the same permissions.

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softecsolutionsAuthor Commented:
Thank you for the links.  They have been very informative.  I think the SharePoint server may need more help than I thought.  I do not have the user profile services listed under the services running.  In fact, the list of services is failrly small in comparison to the screen shots, although this is a simple installation.  Looks like I am going to need some time to sort this out.  Well, gotta run.  Clients are waiting.  Thanks again.
No problem,
hope that i could help you ;)
softecsolutionsAuthor Commented:
Sorry for the delay.  I haven't had time to try the solution yet, but I assume it would work.  The problem went away on it's own.  Kind of weird, but it is Microsoft.  I find Sharepoint works more through good luck and voodoo than good engineering, but like I said, it is Microsoft. ha.
It should be noted that the proposed solution does not actually work for the subject issue. SharePoint Foundation 2010 does not have the User Profile Service available.
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