Black boxes appearing around dialogue boxes etc

Hello, I'm new and I hope someone can help me with this problem please!

Basically, on my colleague's Mac at work she keeps getting these strange black and grey boxes which appear around menu items and the dialogue boxes. It's not a huge problem, just an annoyance for her that we'd like to get rid of if possible please! I've attached a couple of screenshots below to illustrate the problem. We'd be really grateful if anyone has any ideas on how to get rid of them!

Thanks in advance.

That looks like something in Univeral Access, in Preferences, for partially-sighted users or something.

Look below your thread in the Similar Threads section. This question has been asked many times before and the answer is there. Please use the forum search.

Thanks, it's possible that something may have been activated by mistake, I'll ensure everything in Universal Access is switched off and see what happens.

MacHeadCase said:

Look below your thread in the Similar Threads section. This question has been asked many times before and the answer is there.

Click to expand...

Thanks, sorry about that.

It's the VoiceOver cursor, in System Preferences, Universal Access, Seeing, Voiceover Utility. Turn off the Show Voiceover Cursor option on the Display tab.

knightlie said:

It's the VoiceOver cursor, in System Preferences, Universal Access, Seeing, Voiceover Utility. Turn off the Show Voiceover Cursor option on the Display tab.

Click to expand...

Thanks, someone must have activated it by mistake, all sorted now.