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This has been tested on LabVIEW 2009: If you run the attached VI you will see that the scrolling will stop even tough you did not "mouse up". If you remove the mouse move event, everything is back to normal. Somehow the mouse move event is interfering with the scrolling. <object width="886" height="530"> <param name="movie" value="http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/jingswfplayer.swf"></param>'>http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/jingswfplayer.swf"></param> <param name="quality" value="high"></param> <param name="bgcolor" value="#FFFFFF"></param> <param name="flashVars" value="thumb=http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/FirstFrame.jpg&containerwidth=886&containerheight=530&loaderstyle=jing&content=http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/2009-08-20_1533.swf"></param> <param name="allowFullScreen" value="true"></param> <param name="scale" value="showall"></param> <param name="allowScriptAccess" value="always"></param> <param name="base" value="http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/"></param>'>http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/"></param> <embed src="http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/jingswfplayer.swf" quality="high" bgcolor="#FFFFFF" width="886" height="530" type="application/x-shockwave-flash" allowScriptAccess="always" flashVars="thumb=http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/FirstFrame.jpg&containerwidth=886&containerheight=530&loaderstyle=jing&content=http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/2009-08-20_1533.swf" allowFullScreen="true" base="http://content.screencast.com/users/PJM_LabVIEW/folders/Jing/media/01db0d71-dee8-4cff-89e4-753c60f812f2/" scale="showall"></embed> </object> Note: while this does not seem that bad in the video above, in some situation it is so bad that it becomes very difficult to scroll. mouse move scroll bug.vi PJM

This goes for all similar events - like the cursor move event, or the window resize event e.g. - the GUI will be affected by how quick the event is handled. This is why I typically just set a flag in the event case and then do the processing of the event somewhere else. The ideal solution would be to be able to set the event structure to have a lossy buffer..i.e. it should only keep the latest unprocessed instance of the event, not stack them up. (It has been proposed on the Idea Exchange already).

They have there place in LabVIEW I guess. For the stuff I do I rarely use them. Except for the File Dialog Express VI, I always use that.