If you give complete and detailed information about your setup and the issue at hand, such as your platform (Mac or Win), exact versions of your OS, of Photoshop and of Bridge, machine specs, what troubleshooting steps you have taken so far, what error message(s) you receive, if having issues opening raw files also the exact camera make and model that generated them, etc., someone may be able to help you.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
So you're complaining that MacOS is drawing an incorrect preview of your PSD files?
Photoshop has no control over how MacOS renders the previews - that is entirely up to Apple (and we know they still have several bugs reading PSD files).
I don't use Mac, but we have various PSD viewer options with Windows. A quick Google found this, which AFAICT is similar and works with OSX up to Mavericks:
If anyone has experience with this or similar app, it would be useful to hear an opinion.