I am new to these forums, and I hope I chose the right one.
I use ISE 11.4 Webpack on Windows XP for a few weeks. I am currently writing a VHDL source file that is not yet a component of the main project. The "Check Syntax" button was helpful, but surprisingly, when I modify the source file and save it, that button is not available directly, it stays in the previous state (e.g. error), and I need a right-clic-Rerun. It is not so bad, but annoying.