If this is some form of bug, you probably won't like this line of questioning which assumes it isn't--so don't be offended. Are you sure it is not drawing anything? Have you tried selecting what you just drew after drawing it by using the selection tool to drag/select around the area? When you draw something with an alpha of zero, it will be invisible, seemingly disappeared, but it is there.
> Have you tried selecting what you just drew after drawing it
Yes I did try, of course.
Believe me, it really doesn't draw anything. And as I mentioned, if I select a previously drawn shape (pure shape, no clip nor drawing object nor group) and set alpha of the very color to zero, the drawing disappears, I don't mean it becomes invisible (that would be what I expect), I mean it disappears.
I can see it because no selection is shown in blue and the frame is shown as empty. I can't select anything. There's simply nothing.
More than a bug I guess it is some sort of stupid feature that in the mind of a drunk man sounded useful; that's why I'm hoping it's a default behaviour that can be changed by some setting.
No it isn't a feature. It is definitely a bug. I experienced this once before. I had the part where if I selected something that already existed and changed its fill to alpha 0 then it just disappeared. And I too thought it was somebody had made a really bad programming choice when writing CS4.
But then it went away. I've never figured out what caused it or why. I think at the time my response was just to set the alpha low (1%) with a thought like, "Well, that is hella annoying, I don't have time to deal with it now I'll come back and figure it out later." And then it just got better on its own.
Sorry I don't have anything specific other than to tell you that you aren't alone and you aren't imagining it!
You have updated to 10.0.2? I can't remember if it happened to me before the update or not. Are you on a Mac or PC? I also can't remember if this happened to me at work or home, so I don't know which one I saw it on. BTW I just tried it on my Mac and I can draw and/or change a shape to fill alpha zero.
Are you by chance drawing a black rectangle? If so, do other colors work? I seem to recall that (black fills + 0 alpha making the shape disappear) was one of the things fixed in 10.0.2, so if that seems to be the case I would run the update and see if that fixes the issue. If the updater does not fix it, attaching a file would be helpful. I can assure you it was not a drunken choice to do that on purpose, the thing that was fixed was an issue of number conflicts.
Yeah you're right!! It happens only with black.
I was so totally SURE I had tried with other colors!!!! I must have imagined that part (or failed to change the color for some reason).
Well I will update then.