No connection to apps store or iTunes after download of mountain lion on "other" user accounts on this mac

after downloading mountain lion my other two users are unable to access i tunes /or apps store . There seems to be alot of "querky" thing that have become a problem useing since this download ,has anyone had similare problems?

Don't quote me on this, but I think that the rules may have changed for Mountain Lion and you may need either 2 matching pairs or at least matching modules installed in both bottom slots.
as per > iMac: How to remove or install memory
Additional notes i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand).

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