Hmm, your logs says `System plugin path: C:\Users\me\Geany 1.36\lib\geany`. In the first post you said `C:\Program Files (x86)\Geany\share\geany-plugins\git-changebar`, these paths don't match. Did you change the installation prefix in the meantime or might this be the problem? Can you post the directory contents of `C:\Users\me\Geany 1.36\lib\geany` (or whereever Geany is installed).
Did you install Geany and Geany-Plugins into the same prefix? This is the recommended way.