Installed 283.2 (beta) and it didn't improve anything. When on an iOS devices (tested on iPad and various co-workers iPhones), it just won't load when there are sounds in the app.
Also, my Nexus 7 just got updated to Android 5.0 (Lollipop) yesterday evening, and at first, sounds weren't working anymore in Chrome (I was very mad). Tried MP3 and M4A. Then I tried Firefox and it worked. Then I went back to Chrome, and then it worked again in Chrome. Very, very weird.
It still works perfectly on my Nexus 4 phone that is still on Android 4.4.4 (KitKat).
So right now, the situation is :
Internet Explorer 11 (PC) : Runs perfectly.
Chrome (PC) : Runs perfectly.
Chrome (Android 4.4.4) : Runs perfectly
Chrome (Android 5.0) : Runs but didn't have sound at first. After trying it in Firefox, Chrome started playing the sounds when I went back to it.
Firefox (Android 5.0) : Runs perfectly
Safari (iOS) : Load up to about 75% then stop. If you touch the screen, the preloader jumps to about 90%, then stop completely and refuse to go any further.
So I guess, my solution for now would be to find an alternate way to build my e-card without using Clickteam Fusion as I can't seem to get my app (which is only a very simple animation by the way, without interaction from the user) to run with sounds on any iOS devices (which is very important to my employer).
Flash is out of the question because it doesn't run on most mobile platforms anyway, so I guess I'll try to convert my HTML5 animation into a movie file and put it on an HTML page through a player that will work on all platforms. A lot less elegant in my mind, but I have a deadline to meet and need a working solution. I'm not really blaming clickteam for this, as I know technology is always evolving and there's always restrictions to deal with on various platforms, so I know it's not that simple. But that doesn't change the fact that I need my e-card to be ready and functionnal, and for that, I need a reliable solution right now, as time is somewhat against me.
So if a solution could be found quickly, then that's great and I'll be very happy. But I need to start working on a "plan b" if the issue doesn't get resolved over the next two weeks.