Do you mean compilation errors or runtime errors you get during debugging?
Can you give an example of script line that you were dealing with?
I'm embarassed because I can't find the source of the error message I get in the beta version.
The 3.4.0.16 editor gives me errors... but I don't know for sure if it's the same errors the errors that cause the beta not to run the game...
In order to troubleshoot this, I can't do better than proceeding chronologically. So it will be a long post, sorry

1) my project runs fine with version 3.4.0.16
2) I tried
3.4.1.4 editor : compiling and running both failed, with getting a "generic" error message, without any more informations.
3) I tried
3.4.0.16 editor alongside
acwin 3.4.1.4 : compiling and running work ; I got a "documented" error only when the faulty line was reached (null pointer referenced, with line number).
My code was :
Global script :
GUI *gStart_Screen;
export gStart_Screen;
...
function game_start()
{
if (Game.TranslationFilename == "default")
{
gStart_Screen = gStart_Screen_FR;
}
}
Room script :
function room_Load()
{
gStart_Screen.Visible = true;
acMusic_start = aMenu.Play();
}
The error pointed to line 3 :
gStart_Screen.Visible = true; of course, since
Game.TranslationFilename == "default" was impossible. Error fixed.
4) Still with
3.4.0.16 editor + 3.4.1.4 acwin, the game compiles and F5 runs OK... and then, a new error ("Null pointer referenced"). Here is the code:
This is the first room (welcome screen):
AudioChannel *acMusic_start;
function room_Load()
{
gStart_Screen.Visible = true;
acMusic_start = aMenu.Play();
}
function room_Leave()
{
FadeOut(3);
int Volume_fading_speed = 1;
while (acMusic_start.Volume > 0) <- THIS LINE CAUSES THE ERROR
{
if (acMusic_start.Volume - Volume_fading_speed >= 0 )
{
acMusic_start.Volume = acMusic_start.Volume - Volume_fading_speed;
}
else
{
acMusic_start.Volume = 0;
}
Wait(1);
}
if (acMusic_start.IsPlaying != true)
{
acMusic_start.Stop();
}
gStart_Screen.Visible = false;
}
The error is at line 17.
At this point, I'm lost: the compiled game (step 4) runs fine (the affected script creates a music fade out) while when run inside the editor with F5, it causes the error...
5) Trying
3.4.1.4 editor and acwin : game does not compile, does not run / generic error message
To know more about the error with the beta version, I must fix this new error but I do not find its cause (since
acMusic_start was defined at the top of the script and did not cause any problem prior in the script - but there are many chances the error is my fault).