http://www.mayoclinic.com/health/beta-blockers/HI00059

I don't recall reading that they CAUSE diabetes in the past

H. But they can affect how people perceive low blood sugar, and so they have a warning for diabetics. The drug blocks the signs of hypoglycemia. That does not mean it changes blood sugar, only blocks the nervous system's symptoms. So a person gets no warning when blood sugar dips, and may faint, etc.

The only major thing I have seen over the years is the effect on blood lipids.

Beta Blockers are no longer considered "first line" in primary hypertension treatment in USA. The trend is to ACE inhibitors now.

But beta blockers are still used very frequently.
The older propranolol does cause depression and memory loss, esp in older patients. But the newer cardioselective ones do that less so.

There are some new concerns.... however:
http://www.informationaboutdiabetes....e-diabetes.php
I don't know if this worry, is because people with high blood pressure already are insulin resistant, or
that the study pool was pre-diabetic. If you have good dietary habits, that would be a plus for you.
I don't think it is cast in stone however, that you could get diabetes. (until more information is gathered)

Here is a very new article on the topic:
Here is an article on various drug combos and diabetes incidence:
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum

We will have to wait for more I think on this subject. Watch your diet in the meantime.