Micro Focus Visual COBOL for Eclipse installs as a plugin into a standard Eclipse project. It is possible that some corruption has crept into the Eclipse cache. Try launching the Visual COBOL for Eclipse application with the -clean option.
"C:\Users\Public\Micro Focus\Visual COBOL\eclipse\eclipse.exe -clean" would start the product in a typical installation location.
This will instruct Eclipse to clear the plugin cache, and reload the cache from the standard plugin locations, and result in a longer than normal start time for Eclipse.