I just noticed in the help file for the "manual parameter tuning" options, you say...
***Mac OSX***
***Parameters are stored in a plain text file that you can modify with a plain text editor like TextWrangler or similar. They are presented as follows:***
***<key>category/name</key>***
***<string>value</string>***
...in Mac OSX you actually use dot notation, so the above becomes...
***<key>category.name</key>***
***<string>value</string>***
...then the parameters work Using the version with the "/" gets ignored by QLC+