I have the same problem. I didn't change the ISE or the EDK version but - unfortunately - I had to install Perl on Cygwin and so it updated itself too. Before the update everything was working great. Trying to create the bitstream for a design that was working fine before now I get:
Starting Placer FATAL_ERROR:Portability:PortDynamicLib.c:358:1.27 - dll open of library failed due to an unknown reason. Process will terminate. For more information on this error, please consult the Answers Database or open a WebCase with this project attached at
formatting link
ERROR:Xflow - Program par returned error code 91. Aborting flow execution...
make: *** [implementation/system.bit] Error 1
Done!
I'm sure that if I restore cygwin everything is going to back to normal but looks like is not that easy to do.
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