Emulator

What type of information do you need?

iMac 27" Core i7, 3.4Mhz, 32Go RAM Yosemite 10.10.2

All games do that. So it is not a problem with games. It's the way Dolphin behaves. And this is not a normal OS X app behavior. What else can I say...
The mouse just disappears, and I can't get it back to use the menu or do anything. All I can do is hit the ESC key. No other OS X application does that when in full screen mode.

The Graphics menu (at least on Windows-it should be the same on OS X) has an option to show or hide the mouse cursor.

Yes, that is exactly it !! This a more precise explanation than the one I gave. But this is it.
And I don't have the "hide Mouse Cursor" option checked either.

This option hides the mouse cursor altogether, even in non-fullscreen mode. This is not what we're talking about here.

Something is definitely wrong with this behavior in full screen mode. And it is very annoying.

I hope you do have enough information now.

Is someone looking into this?

Apparently not. Very sad ...

I get exactly the opposite issue with 'Hide Mouse Cursor' checked. I'll be able to see it in the render window, and after clicking it'll disappear for an instant and come strait back on screen again. The only way to get rid of it is to move it out of the way.

Well, that tells me something is definitely wrong here. Either way, it needs attention.

OS X normal behavior is not that in full screen mode.
You should be able to conceal the mouse when this button is checked, but retrieve it as soon as you move the cursor. And full screen should be activated by clicking the green button. As on any OS X app.

That is what I would expect.

Really? Nobody is looking into this?? Really?

Don't expect a solution so quickly. As annoying as it is, we don't have nearly enough OS X-using developers to strongarm into investigating a mostly-harmless (if incredibly annoying) UI bug like this.

Need I repeat the whole part where these developers are doing this in their spare time? v_v;

Okay.

i didn't know developers did this in their spare time. Sorry.

I just hope someone will look into this, as it is VERY annoying indeed.

Cheers.

4.0-6165 has not fixed this issue for me. With 'Hide Mouse Cursor' unchecked, the cursor is always visible (expected behaviour). With 'Hide Mouse Cursor' checked, and dolphin not in fullscreen, the cursor is hidden when placed over the render window. (expected behaviour) The issue appears when 'Hide Mouse Cursor' is checked, and Dolphin is in fullscreen, as the mouse will only hide for a few seconds after being clicked, then immediately reappear. (it should say hidden) Note: I have 'Render to Main Window' unchecked, as it's default.

I can't seem to replicate the behaviour you are describing. With Hide Mouse Cursor checked, the cursor stays hidden all the time for me, including in fullscreen. Is there anything unusual about your setup (secondary display?).

In any case, 4.0-6165 indeed fixes issue 8376 (Show the cursor in os x fullscreen by default), the problem you are describing is a different one, if you have a look at the issue summary on the top of this page.