VERIFIED SOLUTION i
Product Feature: Foundation Configuration suite
Under certain circumstances it may appear that the drag and drop functionality of the Portrait Foundation Process Modeller isn't working.
The palette of the process modeller is actually a web control and occasionally the default security settings of Internet Explorer are too strict to allow the proper interaction with the modelling canvas.
ResolutionUPDATED: August 24, 2017
Go to the security tab in Internet Explorer's options and select the 'Internet Zone' so that it is highlighted. Click the custom Level button to bring up the customisation property page. Under the Miscellaneous section make sure that 'Drag and drop or copy and paste files' is set to enabled. The process modeller should now work as expected once the application has been restarted.