JSesh is used and supported by the IFAO .
JSesh is featured on sun's swing sightings previews 23!
Some people have told me they had problems installing JSesh on Windows 7 or 8, running Java 1.8.
I think it's not generalized (I can certainly run JSesh on my PC running Windows 7).
(some people seems to have similar problems with other java softwares: http://ibkb.interactivebrokers.com/article/2281)
Solved: install JSesh 6.5.5
Try installing java 1.7 or 1.6 : http://www.java.com/fr/download/manual_java7.jsp