Cannot starting X Server

[Nikolay]

I have installed The latest Cygwin and then installed XFree86 version
4.2.0 and attempted to start the X server but no matter which method I
used to start the server I get the following error message:
the procedure entry point _XLockMutex_fn could not be located in the
dynamic link library libX11.dll.
I have the dll to which it is referring in my /usr/X11R6/bin directory.
Have I done something wrong? Is this a known bug? 
Please reply directly to me because I haven't joined the mailing list.


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