I created a bare-bones Virtualbox VM with centos 7 (guest OS) that reproduces this issue. I did this with Windows 7 as the host OS but I think other host OSes will probably work. The link to download this VM is in the instructions below.
Steps to reproduce:
Download/Install Virtualbox (it is free for commercial use, that is why I used virtualbox, current version 5.1.26 should be sufficient)
In VirtualBox, File->Import Appliance
Import the "centos7-1511.ova" that you can download from:
https://drive.google.com/open?id=0B7AlniF_4GyYb3dWbmRkcUFUb0UStart the VM
Maximize the screen running the VM, since Virtualbox guest additions is installed on the VM, the guest OS should fill the screen
at login screen, provide password "setest" for the user of same name
Wait for desktop to come up
Right click on desktop and select "Konsole"
$ cd /home/setest/slickedit-pro2017beta2/bin
$ ./vs &
In SE, Project->Open Workspace
Navigate to folder: /home/setest/Downloads/file01/public/clark/runcontext-project/runcontext
Open workspace: runcontext.vpw
In Smart Open tool window, navigate to /home/setest/Downloads/file01/public
Type "runcontext"
Double click on "RunContext.hh"
Double click on "RunContext.cc"
Notice that the extensions are hidden and problem is reproduced
I also created a VM snapshot with this issue reproduced, but not sure if that is available in the appliance that you can import.