In 2.4 there is an error message "Error opening example files" with no further description. This occurs early in the startup process. You cannot open the example files via file --> Example nets.
The cause of the problem is the space in the directory (folder) name "Example nets". I'm running on Mac OSX (everything up to date). The project name in Eclipse has blanks in it, and when the URL to string
conversion is done the project name blanks are transformed into the URI form of "%20". I've got code that I'll update by Tuesday (after I test it on a Windows machine) that finds the blank, changes it to "%20" and this works.
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Code revised in GuiFrame. This problem did not occur when tested on Windows. The solution implemented is safe and does nothing on a Windows machine. The revised code also does a printStackTrace when the "Error opening example files" message is produced.