Neither Adobe Photoshop 24. nor 25 are opening up any files. Been going on for a couple of weeks.

@deserette 

Axel is right.

The preferences contain the entire application configuration, not just your own user settings. Preferences are prone to corruption because they are rewritten on every application exit, as opposed to read-only program files. Any irregular shutdown can corrupt them.

Especially risky is if you opted to migrate settings from the previous version. Errors accumulate, and then you'd inherit latent problems from the other version.

Always safest to start a new version with clean sheets.

thanks, but I never even used photoshop 25 before! I only opened it cause 24 didn't work! so preferences had not been changed.

By @deserette

Even if you didn't change the settings yourself, problems can still occur. You should still try resetting the settings to the default values.

thanks, but I never even used photoshop 25 before! I only opened it cause 24 didn't work! so preferences had not been changed.

Try to reset Photoshop's preferences to the default settings.If they become corrupt then various issues can occur.

Here’s some info on how to do that:

https://helpx.adobe.com/photoshop/using/preferences.html

Manually removing preferences files is the most complete method for restoring Photoshop to its default state:

This method ensures all preferences and any user presets which may be causing a problem are not loaded.

• Quit Photoshop.
• Navigate to Photoshop's Preferences folder.
  macOS: Users/[user name]/Library/Preferences/Adobe Photoshop [version] Settings
  Windows: Users/[user name]/AppData/Roaming/Adobe/Adobe Photoshop [version]/Adobe Photoshop [version] Settings
  
  Note: The user Library folder is hidden by default on macOS. To access files in the hidden user Library folder, see How to access hidden user library files.
  
  
• Drag the entire Adobe Photoshop [Version] Settings folder to the desktop or somewhere safe for a back-up of your settings
• Open Photoshop.

 New preferences files will be created automatically in their original location
 

@deserette I would do un-install of Photoshop. Use the Adobe Cleaner from adobe website, not a third party site, https://helpx.adobe.com/ca/creative-cloud/kb/cc-cleaner-tool-installation-problems.html 

This way, you know you are uninstalling all of the Photoshop bits and pieces that is well, maybe crashing your files and not opening. 

Then once all that is done, go to adobe.com or the Adobe Creative Cloud Desktop and install Photoshop. Just make sure your system can handle it. The latest Photoshop, shows my MacBook Pro, can't install it

@deserette try using the Adobe cleaner tool

https://helpx.adobe.com/ie/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

P.S. for some reason the app thinks it is open, cause it asks me if I would like to save changes! It also shows the files in the history of what I opened last, but i never get to see the files!!!