The Mystery Wrap

[Dodd, Frank J]

 When converting a framemaker document to an adobe PDF I suddenly get
sentences that wrap onto the next line. 
The only item I can attribute this to is the fact that adobe converts
all the Helvetica fonts in my FM file to Times new roman.... 
Does anybody have any idea :
Why the change to another font?
Why the mystery wrap?
How to change all the fonts in every style to Arial in one fell swoop?

Frank