Garry's mod server loading screen

Can you use flash to create a loading screen when a player connects to my server ?

loading screen do not work on last patch

They work just fine.

I wouldn’t recommend you to use flash on a loadingscreen, even if it’s possible. Flash tends to crash clients. (At least it does in normal HTML panels)

I can’t seem to get it working.
My screen doesn’t load at all, though the music in background does. So it seems it loads the page, but doesn’t display it correctly.

I believe this has happened after some last updates indeed.
As none of servers I join now, has a working loadingurl.