I live in Zone-5 and have a perfectly beautiful dwarf variety blue
spruce and 12 Arbor Vitaes. However, over the past few weeks they
seem to have developed some thing that is drying up their branches
(brown, NOT grey as yet; no sap; no fungus; or other problems). They
practically look like they are being dried out to use for flower
arrangements . Are there any suggestions on what could be wrong
with them and how they can be fixed??

You don't say what part of the country you live in, but in many areas spruce
are being hit by both the spruce ips beetle and the white pine weevil. If your
damage is occuring at the top of the tree or tips of upper branches, your may
want to look for borer holes. Another consideration might be environmental
problems that affect the roots. Are they getting enough water? too much water?
close to pavement or structures that reflect heat? Soil compacted by traffic or
construction?
Just a few ideas.
sed5555