Dimensions on a 10mm Slot

hi all,
just upgraded from 2004 to 2007 Sp2
i have a cut feature slot 20mm long 10mm diameter trying to dim theslot end to end with a center mark inplace, it will only let me dimto the centre of the arc but then i normaly do properties thenselect max, but that is no option, then i found if i remove thecentre markform the arc the min, centre and max options are there,is this a new thing or a sp problem. i find this a pain as i neverhad this problem in 2004. any one else had the same problem or knowwhat im doing wrong?

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