I just packed up my third app from B4J using Launch4j. The first two work great.
This one, however, has a big problem. It starts to open, the frame of the form renders, but not the content, but then it closes, and then it opens again, and then it .... you get the picture.
I've attached a link to a video of my screen to show what it's doing (I'll take it down as soon as this is sorted). I can't find anything in the forums with search that relates to this and have no idea why. I made the same settings (I think) as in the first two. I added the jar and an icon file (which I did with the other two).