I am having a problem since I upgraded to 8.4. I have a project specific path variable called PluginBuildOutput set to the environment variable %PLUGIN_BUILD_OUTPUT%. The environment variable on my computer is set to D:\PluginBuildOutput. When advanced installer loads or when it tries to build, it is appending the environment variable incorrectly. The path variable is set to be D:\Code\plugins\%PLUGIN_BUILD_OUTPUT%. (which resolves to D:\Code\plugins\D:\PluginBuildOutput)
D:\Code\plugins is the value of my project root path.
Any suggestions? I had not been having any problems with my projects before I upgraded.