I recently updated from JAVA 6 Update 7 (build 1.6.0_07-b06) to JAVA 6 Update 17 (build 1.6.0.11-b03). After doing so the Java Virtual Machine Launcher reports the following error if I try to run Galleon executables: "Could not find the main class: org.lnicholls.galleon.gui.Galleon. Program will exit.".
Galleon About reports "Version 2.5.5, Java Version 10.0-b23". I am using Windows XP Professional Version 2002 Service Pack 3.
I'm having the same issue. On Windows 7 x64 for me, but I'm using 1.6.0_17-b04 which is the newest at the time of typing this.