Xlib error on running GTK app

["Renuka K" <renuka kusurkar gmail com>]

Hi,
I am using a multi-threaded application in which my GUI thread is spawned from the main thread.
the GUI comes up fine but any action by user hangs the application and gives me an error:: 

Xlib: unexpected async reply (sequence 0x626)!


Can anybody please help me out with this? 

Thanks and Regards
Renuka Kusurkar