Unable to run the command 'captureEntirePageScreenshot' in some Browsers

Hi Guys..
i am new to Selenium, I cme across many problems while using the Selenium tool but now somewt ok with all that as i found the solution but still some exists.. Like;
The Command 'captureEntirePageScreenshot', i am unable to run it in 'Google Chrome' as it shows failure.
I here convert the HTML scripts to C# and run the same in N Unit by editing that in the Visual Studio.
I found the scripts running well in 'iexploreproxy' and 'chrome' but not in any other browsers like Google chrome, Safari..etc..
I tried finding the solution for the same but some wr it was given as like it is a bug in the Selenium RC.
Could somebody help for the issue mentioned or is there any other ways to tackle this problem..

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Thanks in Advance..
Sanjay