When I run synthesis through Project Navigator, the following message occurs:
"There was a problem with XST and ProjNav will close"
When I reopen the project, the synthesis failed in low-level synthesis with an internal error:
"INTERNAL_ERROR:Xst:cmain.c:3110:1.8 - To resolve this error, please consult the Answers Database and other online resources at http://support.xilinx.com"
This problem has been fixed in the latest 9.1i Service Pack available at:
The first service pack containing the fix is 9.1i Service Pack 1.