I’ve given up on JSOM for maybe a year ever since Option+Click+hold quit dragging/scrolling the map. While I’ve seen a lot of suggestions on how to get this working again, it appears the best solution is hardware: get a two button mouse and Right Click+hold to scroll.
Discussion
Comment from escada on 23 April 2014 at 14:14
I recently filed a problem with Java 7 and JOSM for this. I had no problem with it on Java 6. Did you by any chance moved to Java 7 a year ago ? Anyway, the team seems to be working on the issue.
regards
Comment from Stereo on 25 April 2014 at 12:01
The team is indeed working on this exact issue:
https://josm.openstreetmap.de/ticket/9897
I like to use ctrl-arrows to move.