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Visualforce page development mode tools

Hi, Experts - Today some reason, on any custom visualforce page (new or existing) in development mode tools area, coding is not fully expanding. You just see a little bit, but it is not opening. Navigation: /apex/new_page take yes on new page creation and then page splits into half, but code area does not expand. Any of you experienced this or can verify would help!!! Thanks,

I am also facing the same problem , please post back if you fing any solution


I am also facing the same problem !!!!


Not working with any browser : IE, chrome, firefox 


But at another computer all working .. strange ...


Did deinstall/install on browsers, java, all latest installations - still not working!!!


Already invited reformat my work computer :)

May be will wait with format :) 


something wrong with js libraries!


Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; CMDTDF; InfoPath.3)
Timestamp: Wed, 25 Jan 2012 05:40:18 UTC

Message: 'SfdcApp' is undefined
Line: 10
Char: 345
Code: 0
URI: https://XXXvisual.force.com/jslibrary/1323850589000/sfdc/VFDevMode.js