Move function copies instead

Hard to reproduce this error, but sometimes when you click "MOVE" on a note, it copies it instead (the old note stays in place, and a new note is created). Mel has seen this twice on 2/27 but doesn't yet know what triggers it.

* First time: the notes in question are at the intersection of Amsterdam Ave. and W92/93, both green flowers. (notes 29 and 30) * Second time: the notes in questions are both elderly-people notes, intersection of Columbus Av and W. 89 and 90. In addition, the note icon (a third one) "stuck" to the mouse cursor (as the mouse cursor moved around, so did this icon; left, right, and double clicking had no effect). In fact, I could add new notes of different types (the icon for the other type of note would show up behind the "stuck" icon) normally.

JS log from the second time this happened is given below.

First two errors given below.

element has no properties
fromString()OpenLayersSFB.js (line 192)
moveTo()OpenLayersSFB.js (line 243)
deleteCookie()VespucciSFB.js (line 127)
successfulRequest()VespucciSFB.js (line 166)
successfulInsert(Object layer=Object data=Object)VespucciSFB.js (line 167)
addToMapOnSuccess(Object layer=Object data=Object)VespucciSFB.js (line 181)
onLoad([Object layer=Object data=Object])VespucciSFB.js (line 174)
isLoggedIn(Object request=Object transport=XMLHttpRequest)VespucciSFB.js (line 149)
processStatusCode(Object request=Object transport=XMLHttpRequest, function(), function(), function())VespucciSFB.js (line 130)
processStatusCode(Object request=Object transport=XMLHttpRequest)VespucciSFB.js (line 128)
success(4)OpenLayersSFB.js (line 166)
onStateChange()OpenLayersSFB.js (line 161)
bind()OpenLayersSFB.js (line 59)
[Break on this error] return newBounds;},CLASS_NAME:"OpenLayers.Bounds"});OpenLayers.Bounds.fromString...

this.layer has no properties
destroyPopup(lon=-8234705.159221861,lat=4981343.8048803 lon=-8234705.159221861 lat=4981343.8048803)OpenLayersSFB.js (line 568)
featureMoved(POINT(-8234705.159221861 4981343.8048803) id=OpenLayers.Geometry.Point_3791)VespucciSFB.js (line 114)
callback("done", [POINT(-8234705.159221861 4981343.8048803) id=OpenLayers.Geometry.Point_3791])OpenLayersSFB.js (line 356)
finalize("done")OpenLayersSFB.js (line 696)
finalize()OpenLayersSFB.js (line 696)
finalize(click clientX=0, clientY=0)OpenLayersSFB.js (line 696)
remove("click", click clientX=0, clientY=0, [click clientX=0, clientY=0])OpenLayersSFB.js (line 298)
handleBrowserEvent(click clientX=0, clientY=0)OpenLayersSFB.js (line 300)
bind(click clientX=0, clientY=0)OpenLayersSFB.js (line 59)
[Break on this error] return atPoint;},destroyPopup:function(){},move:function(location){var pixel;if(...