What does this mean? Screen Shot 2015-05-31 at 12.16.52 PM

It means that something has caused a screenshot to be taken.

I don't know whether it's related, but "Norton" is worse than useless and should be removed.

Remove the Norton/Symantec product by following these instructions. If you have a different version of the product, the procedure may be different.

Back up all data before making any changes.

Norton Antivirus (made by Symantec) has a very long and illustrious reputation for mangling Mac OS X systems, sometimes to the point where a complete reinstall is necessary. Among other things, it installs kernel extensions which are known to cause kernel panics and system freezes; it contains known and documented bugs which can silently corrupt Adobe Photoshop and Adobe InDesign files, destroy a user's ability to authenticate as an administrator, and (on PPC systems) can cause Classic to stop functioning; and Symantec has on at least two occasions now released flawed .dat file updates which erroneously report certain critical Mac OS X files as "viruses." (Deleting these "viruses" causes damage to the system that in some cases renders it unbootable.)

Norton has also been reported as damaging iPhone backups.

A major security flaw in Norton has also been noted:

http://www.macnn.com/articles/15/05/08/contentious.utility.ignored.apple.guideli nes.created.zero.day.exploit.128538/

Norton Removal Tool (Symantec Uninstaller):

http://www.symantec.com/business/support/index?page=content&id=TECH103489&locale =en_US

The message is telling you that an Adobe Flash Player update was blocked by Norton.

Adobe recently released yet another in a continuing stream of Flash Player updates to address security vulnerabilities as they are discovered, likely to Flash version 17.0.0.188, (that is latest one as of 9pm EST on June 1, 2015, but I'm on OS X 10.8.5, not 10.6.8)

Even if you have previously set Flash Player to update automatically, Norton is apparently blocking it, and perhaps any notification that there even IS an update.

To safely install an Adobe Flash update, one way is on your system, click on , System Preferences, when it opens, select the red (Adobe) Flash Player (likely in the bottom row of the System Preferences screen), select the Update tab, and click the Check for Updates button.

Another safe method to update Adobe Flash is to navigate directly to the Adobe website: https://get.adobe.com/flashplayer/

And another way to deal with the situation is to simply remove Flash and avoid websites that require Flash in order to display content.

And to be clear none of my Flash Update 'fixes' addresses your Norton Antivirus program or modifies Norton to permit future updates, if that's what you want.

Sorry for the trouble. The application blocking is not enabled in the Norton firewall settings by default. You can disable it to stop receiving this alert, unless you want to add certain programs to the blocked list. Connection blocking in the firewall settings is enabled by default, this monitors all the incoming and outgoing internet traffic to protect. If you have any questions, please tweet us at @NortonSupport anytime.

Thanks!

Harini

Norton Support

Do NOT install Norton anti-virus.

Hi,

Could you provide the screenshot that message? And also tell us what is the version of Norton Internet Security running on your Mac?

Harini

Norton Support

There is no screenshot in your post, just a filename.

Use the camera on the toolbar to insert the screenshot. Or drag the picture in.