Hi Martin, yes the Radial dimension by default displays a cross marking
the center of the dimensioned arc or circle.

You can see it in your PDF output if you zoom in:





You can turn it off by selecting that one radial dimension for R259.50 and then click the "Details..."
button in the upper right properties panel. Then on the detailed object properties dialog set the
property for Radial dimension > "Cross size" to be 0 and the cross mark will be disabled for
just that one particular radial dim:



- Michael