ACAD 2011 /DWG to PDF.pc3/ Can't get 2D Arcs to Plot as Hidden

After 2 days of trying to crack this I can use some help please! I've just upgraded to 2011 (which may or may not be the culprit) I use a CTB to Plot my 2D Plan-sets and I'm having problems getting several arcs in the drawing to plotas hidden lines. Lines and P-Lines on the same layer print just fine, it's only the arcs that I can't get to stop plotting as solid lines. I'll detail my settings and include screen shots below, any help at all will be greatly appreciated, Thanks for looking!

Settings

Visual Style- 2D Wireframe

Shade Pplot- "as displayed"

PSLT Scale- 1

Celt Scale- 1

MSLT Scale-1

LT Scale .5, .25, .1 even 1.0 none make a difference

Tile Mode- 0

Screen in Model Space

Screen in Viewport- I'm referring to the RED Hidden Lines

PDF Preview of File- Hidden Lines are Great!

Final PDF- The Lines stayed as hidden perfectly, but the arcs reverted to solid

The exact same thing happens with a another set of of arcs elsewhere in the drawing.

How does it look if sent directly from AutoCAD to a plotter/printer?