When attempting to view the HTML timing report, ISE errors out with a message similar to the following:
"FATAL_ERROR:Cpld:tahtml1writer.c:85:1.11 - Cannot open timing analysis report"
When setting a project location, avoid folder names that have spaces in them.
For example, do not place projects in your "Documents and Settings" or "My Documents" folder.
The ability to use spaces in folder names is supported in ISE version 8.1i.