[Freeswitch-users] Half calls end up in echo mode without counter-party's sound, since 26Jul git version

I have a IVR written in js running on git version. During the test in Jul it works fine. But recently, I find that nearly half calls end up in silence and only echoing its own sound. Checked the recording on server, it is the same. IVR's speech is played back to the FS instead of the caller. The version is compiled on 26jul git. The same problem exist for both of my SIP providers and skypeopen, So it should not be the providers' fault. The git tree today is also tested with the same problem. But when I roll back to 1.0.6 everything back to normal. As I am updating the version quite often in Jul, this is very likely to be caused by some changes just before 26Jul. Does anyone using git version after 26Jul have the same problem?