ispLever Classic 2.1: How to resolve the issue when the text editor in ispLever Classic appears in the taskbar but the window cannot be opened?

ispLever Classic 2.1: How to resolve the issue when the text editor in ispLever Classic appears in the taskbar but the window cannot be opened?

Workaround 1: 
Press and hold the Shift key, then right-click the stuck text editor icon in the taskbar then click Maximize 

Workaround 2: 
You can change the text editor to your own desired text editor as a workaround. 

To do this: 
1. Open ispLever Classic then click Options > Environment 
2. Under General Tab, click the "Use your favorite Text Editor" tick box.
3. After checking the box, browse the executable file (*.exe) of the text editor that you want to use (ex. Notepad++.exe)