Things I did just before this happened:
encountered a black @ in a dungeon near Terinyo; wanted to see what it was, used 'l': look. Also looked at orc, text didn't fit in box at the top of the screen.
Resized screen down to see if that helped. Mouse activated, if I moused over anything it'd show it's descriptive text.
Moved mouse out of way of interesting part of the map, tried using arrow keys to control look. Game popped up "Internal JADE Error" dialog; game appears playable.

An unexpected JADE error occurred.
Please see the stack trace for details.

java.lang.NullPointerException
at de.adom.jade.utils.Direction.getModifiedPosition(SourceFile:231)
at de.adom.jade.ui.ascii.map.AbstractMapInteractionController.moveInteractionPosition(SourceFile:234)
at de.adom.jade.ui.ascii.AsciiUserInterface.interactWithMap(SourceFile:3654)
at de.adom.jade.ui.ascii.AsciiUserInterface.doLook(SourceFile:3627)
at de.adom.jade.ui.commands.CommandLook.executeMetaCommand(SourceFile:46)
at de.adom.jade.ui.commands.MetaCommand.executeImpl(SourceFile:54)
at de.adom.jade.ui.commands.Command.execute(SourceFile:546)
at de.adom.jade.beings.brains.PCBrain.doActImpl(SourceFile:152)
at de.adom.jade.beings.brains.AbstractBrain.doAct(SourceFile:400)
at de.adom.jade.beings.Being.actImpl(SourceFile:777)
at de.adom.jade.kernel.actors.AbstractActor.act(SourceFile:58)
at de.adom.jade.kernel.actors.ActorReference.act(SourceFile:60)
at de.adom.jade.kernel.GameLoop.run(SourceFile:110)

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java....