Dare I ask if you're referring to Xilinx's
"wonderful" ISE Design System?
Altera seemingly learned a lesson long ago: sometimes software is just
too old to maintain. Compared to ISE (and even the old Altera MAX+PLUS
development system), Quartus is a dream to use. ISE has more bugs (I've
found several Logic Synthesizer bugs in ISE, none in Quartus), is less
stable (on average several crashes per day; I've never seen Quartus
crash)...
And you wonder why I prefer to use a pile of 74xxx parts, a rell of wire
and a soldering iron...
-tony