I am sure someone will be able to explain exactly why, View orientation etc
But try this
-Right click on the view
- Change "General Dimension type" to True (Or if already on "true", change to "projected")
Reg Autodesk Product Design Suite Premium 2014 SP1 Build 222 Intel Core i7 (firstname.lastname@example.orgGHz) Windows 7x64 (Home) - 12GB Ram Nvidia GeForce GTX 560 Ti (1Gig - Ver:331.65) Please accept as a solution if it fixes your problem.