Formatting Help

I have some drawings that I have been doing in autocad as part of a set of documents. Some of the items I have drawn were done as blocks so that when I insert and scale the dimensions I have applied to the block register the correct sizes.

My problem is that the vertical dimensions appear to be bold for no particular reason. The horizontal dimensions appear fine, but I have no idea why the vertical ones are becoming bold. There is definitely a noticeable difference between the two and it is causing layout and continuity issuse on the drawing. Is this a problem with some formating issue? I can't seem to find a solution to make them both appear the same. I've attached the .DWG file to show what I mean.

I'm using Autocad LT 2009

AD101 - RF Room Details.dwg

I see no apparent difference between horizontal & vertical dimensions boldbess-neither text nor lines. So, maybe it is your graphics card. Is it just this drawing? What if you compare horiz & vert mtext of the same style?

do these verticle things plot bold or just display bold?

This problem appears in multiple locations with multiple blocks I've created and dimensioned. I thought it may just be the image quality on the screen, but the formating actually appears on the drawings when I plot them.

I compare vertical and horizontal mtext of similar sizes and do not see the same corelation between the two.