Turns out Arasan 8.2 had a serious bug in the UI - "take back" move and then moving forward (with the navigation buttons or by making a move) could cause a crash. This showed up in both Winboard and the native UI. I have fixed this and also made a few other minor changes, and released Arasan 8.3. See http://www.arasanchess.org.
Changes in Arasan 8.3:
1) Small king safety change in eval
2) Fix for crash on make move after "undo" in UI.
3) Some misc. code cleanup.
--Jon