File html 'get and put' not working

all of sudden dreamweaver c3 not letting me open dual 'get , put' screen html file. when hit double arrow grayed out unlock button. show , put not open dual window of files. can double window whole website, not individual html file?

i considering going dreamweaver cloud new computer i'm afraid transfer files if there serious problem them?

i think problem may lie confused cache file. have @ deleting corrupted cache file hoefully fix problem.

 

to transfer files, have @ how import , export dreamweaver site settings

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