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Try booting into Safe mode

<http://support.apple.com/kb/ht1564>

This will not load any 3rd party additions, it will load some more conservative Apple drivers (may cause screen flicker), and it will clear some kernel caches (a cache is saved data in a form that can speed up a program, but is totally redundant to the original source, and thus can be safely cleared).  Booting into Safe mode is just an experiment, but can frequently eliminate any 3rd party interference, or a cached item out-of-sync with the world.  (Verify Safe mode via Applications -> Utilities -> System Information -> Software -> Boot Mode -> Safe vs Normal)

And yes having the EtreCheck output would be helpful

<https://discussions.apple.com/docs/DOC-6174> or <https://etrecheck.com>

Click on the Share icon and select "Copy Report"

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And then Paste the report as a "Reply" to this thread using an "Additional Text" box.

If, AND ONLY IF, you get the error:

    "The message contains invalid characters"

then try posting to PasteBin.com, and give us a PasteBin URL link.

<http://pastebin.com/>

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EtreCheck is a tool that helps Apple Support Community volunteers debug problems without any access to the troubled computers. Debugging problems can be a difficult task even when the machine is in front of you. Attempting it via a discussion forum is extremely difficult. EtreCheck is a great help that regards.

To get a good look at your System config. for conflicts or issues, you can run this utility hhttp://etrecheck.com

If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the toolbar below.