GWT 2.7 rc1+chrome,sourcemap got loaded sometime,sometime not

The composition of 2.7 rc1+firefox 33 works relative stable(sourceMap get shown every time) but the souremap output of 2.7 is too large,and it cause firefox frozen to load it(this problem has been discussed here:https://groups.google.com/forum/#!topic/google-web-toolkit-contributors/o9SlYe0s2j4)

With chrome+2.7 rc1,source map got shown sometime.but sometime,even without any configuration changing, it doesn't show any more(and the request to xxxxsourcemap.json doesn't get sent also),then in sometime,it got shown again.By the way,no matter sourcemap shown or not,my app always got loaded properly without any error in console.when It doesn't show I tried to clean chrome's cache,close it,stop SDM server,clean eclipse compilation cache,and start sdm and chrome again,but no luck.So I haven't find any pattern about this problem.

 Has anyone faced same problem?If you found or knew a way to solve it,please tell 

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