This is a bummer. I am in the middle of snow storm, and decided to work on some sites. I have not had problems with DMX upgrades in years, but now I do.

I am running Dreamweaver CC 2015.1 on OS X 10.11.3

I used Bootstrap yesterday, and all was good. After the upgrade it is crapped out. I did delete the mac cache file, and still no good.

Message I am getting is
While executing onClick in dmxbootstrap3elements.htm, the following javascript error(s) occurred:
In file "dmxBootstrapElements":
addBootstrapCSS is not defined

A quick response is appreciated

Hello Chuck,
Please use the DMXzone Extension Manager in order to install/update your extensions. Also make sure to update all of your Bootstrap 3 extensions.

I always use your extension manager to make updates and I downloaded and updated all extensions at the same time

Please uninstall the bootstrap 3 extensions and install them again. Then restart your DW.