I recently updated my SAP GUI for Windows to 7.50, and I noticed some quirky things to happen, that didn’t appear in prior releases.
One thing I noticed was affecting the Directory selection of the Frontend services (CL_GUI_FRONTEND_SERVICES=>DIRECTORY_BROWSE). It appeared as if my Desktop folder has been set as intial folder, preventing me to traverse up to some more useful folders:
I tinkered a bit around with the Class test tool, and I noticed that, if I provide (root directory) as value for parameter INITIAL_FOLDER, I get the Directory selection I was accustomed.
Finally, I invoked method CL_GUI_FRONTEND_SERVICES=>DIRECTORY_SET_CURRENT (despite the developer comment to not use), providing value for parameter CURRENT_DIRECTORY, and that did the trick.
Now my Directory selection let me select useful folders again: