[DNSB]

Rather odd. What version of Java are you running? If you are running a 64 bit version of Java, you could try modifying the main.py file in the EPUBCHECK directory by modifying the 64 bit command line parameters line to read:

            # define epubcheck command line parameters
            if is32bit:
                args = [java_path, '-Dfile.encoding=UTF8', '-Xss1024k', '-jar', epc_path, '--version']
            else:
                args = [java_path, '-Dfile.encoding=UTF8', '-Xss2048k', '-jar', epc_path, '--version']

I will have to say that running a 64bit Java, I only found 1 time when I got a stack overflow error and that was a omnibus document that to put it mildly was poorly constructed. OTOH, it reported over 1000 errors not the no errors which your case seems to show. OTOH, neither does your image show the version of epubcheck being used.