In version 7.0.0 and 7.0.1 in some rare cases an issue arises that can prevent the results from showing when you finish a process.
Here is a workaround to restore the view.
1) Shutdown Studio
2) Enter “.RapidMiner” folder and delete vlperspective-predefined-result.xml from it.
3) Start Studio and test
Note that this is still a bug in version 7.3.001. I just encountered it today and this fix does seem to correct the problem.
I also encountered this bug today in version 7.5.003. The above fix works and for those on a Mac, the easiest way to locate the ".RapidMiner" folder is to open Finder and enter Shift Command G (or select Go -> Go to Folder ... in the menu bar). Then just put in "~/.RapidMiner/" (without quotes) in the search mask and hit enter.