Alt/Option in Develop module moves user interface rather than showing clipping


i running lightroom 4.1 on 2 macs, both running 10.7.4. on 1 of machines alt/option key not work in develop module.

 

when hold down alt/option key , move exposure or blacks slider expect see clipping display. instead action moves whole of sidebar of user interface. can move place on screen , off edge of screen. should not possible.

screen shot 2012-08-12 @ 23.00.38.png

the problem machine has wacom intuos 3 tablet attached, have tried updating wacom drivers, , removing wacom software completely. neither solves problem. other mac not exhibit problem.

 

any ideas?

 

regards,

 

paul kelly

try removing preference file new 1 created, can cure unusual issues.

http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-4.html



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