I have never seen this behaviour on the Mac but I would take a number of steps

1. Go to System Preferences Security and the General and after clicking the 
lock to make changes make sure  that you can download apps from anywhere.
2. I would then go to Disk Utility and perform a disk permission repair on  
your hard drive. You will be able to get to the Utilities folder in Finder by 
pressing command shift U. Ideally you should do all this in the recovery 
console but try in Disk Utility first.
 3. You could then review your apps folder to see if VLC has reappeared. If not 
install one more time but I would restart your Mac before making this install.
4. It is normal to get the warning  dialogue you describe but you can normally 
navigate it. Hopefully a restart will sort this. Otherwise try pressing tab to 
navigate rather than vo cursor and pressing space bar on continue if you can 
get there. On any button if vo space does not work it is worth trying space or 
ever on it.

David Griffith     
> On 28 Nov 2014, at 09:12, Richard Bartholomew 
> <[email protected]> wrote:
> 
> Hi, again!
> 
> On Wednesday, I installed VLC Media Player and used  it successfully for the 
> rest of the day.  On Thursday, it had disappeared from the applications 
> window and, so, I installed it again and, once more, successfully used it for 
> the rest of the day.
> 
> Today, Friday, it has again disappeared from the applications window  and, 
> so, I tried to re-install it a third time!However, now when I try this, I’m 
> getting a message saying that there’s a new system dialogue and VO starts to 
> read out the message saying that this is an app downloaded from the web.  
> However, the whole message isn’t read out and I can’t navigate to the 
> dialogue box to read and activate the continue button.
> 
> 
> I presume I’ve got the system confused due to my multiple installs and would 
> appreciate any  suggestions as to how to uninstall an app on the Mac and, 
> also, why VLC keeps disappearing after I close the system down at night.
> 
> I’m using Yosemite, by the way!
> 
> Thanks for any help.
> Richard Bartholomew
> 
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