Dimensioning in paper space- Problem with arcs

I am new to AutoCAD, and have been experimenting to find the best way for me
to use viewports, paper scale, etc., taking full advantage of newer features
like associative dimensions, in the context of having no "legacy" issues of
my own.

It seems to me that my purposes would best be served by locking the viewport
scale and dimensioning in paper space. As well as having the advantage of
freeing me from having to think about the text size for dimensions on a case
by case basis, it also handles the situation (which I quite often encounter)
of having to go back and change the scales of individual views after
dimensioning.

However, I am staggered to find that (at least in the drawing I am currently
working on) when I try to dimension a fillet radius from paper space, it
dimensions it to a point which is not the center of the arc, so that
depending what angle I drag the dimension line to, I get a different value !

The same happens with circles. The offset of the dimensioned center from the
true center always seems to be the same.

In almost every other respect this method is ideal for me, so can anyone
advise a way around this (to me) incomprehensible behaviour?

 

I've eventually abandoned the idea of using paperspace dimensions
because of constantly running into problems. Every new release seems
to hold promise for finally making paperspace dimensions work, but
everytime I've been disapointed. Granted, it seems to be 3D stuff
which causes most of the problems, so a 2D designer gets better
results. But, I think incomprehensible behavior is normal for Autocad
anymore.

Joe Dunfee