CATIA V5: problems with text thickness in drawings

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I am using CATIA V5, revision 10. In some drawings the text randomly swithces to some type of bold print, like the thickness is incorrect. However, upon checking the text properties I cant find anything wrong. This only shows up on a printed copy of the drawing or in print preview mode. This happens to any type of text, in dimensions, in drawing notes and in the format. I used the administrator login to customize my standards, but its not very extensive - I dont know if that has anything to do with the text problem. In V4 when this happens its because a standard is changed on a certain piece of text; it is easy to check, it shows up as an increased thickness in the graphic properties of the text. However, it is not random like the problem Im having in V5 and it is easy to check, in V5 nothing looks incorrect in the text properties.

Any help is appreciated.

Thanks