We have a switch but to allow multiple instance, as our default behaviour is not to allow it.
I would advise you remove JD outside of program files path, it could be that JD can not save content like a 'lock/port/pid' files. These files are used for various reasons for example, pid file will show the pid number of running program. Modern Windows operating system can heavily protect the program files directories, this is the main reason windows installers install to %localappdata% for windows vista/seven/eight/ten, and %appdata% for xp.
raztoki
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