Thanks for pointing this out Sweenie. Didn't see that the directx9 package downloaded using "check for updates" only contains debug version
of the DX libraries.
Anyway, a bit of googling later, I found another Directx devpak here :
Download this new devpak somewhere and install it with the devpak manager inside DevCpp.
DO NOT UNINSTALL THE PREVIOUS DIRECTX PACKAGE OR THE IRRLICHT LIBRARY COMPILATION WILL FAIL. YOU HAVE BEEN WARNED !
Re-open the Irrlicht sourcecode project in DevCpp. Change the static link libraries from :
Yes, the "d" is missing now
CTRL+F11 to rebuild and you will get a brand new Irrlicht.dll in release
version. Be sure also to add d3dx8.dll and d3dx9.dll in your executable directory as well. Yes, the "d" is missing there too.
The archive on my website has been updated though.