We had this issue and I discovered it happens when the plotter/printer margin in the modify standard paper sizes area of the plotter manager is set to zero.
I changed the margins to 1 and all our problems went away
I was having the same problem with any text that got close to the viewport edge being cut off. I found in the PC3 files if you look under the device and Document settings, there is a TrueType Text. Select this as graphics rather than text........I have no idea why. Maybe because TrueType fonts are more of a Microsoft than a AutoCAD thing....I don't know. It worked for me.
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