No, the update has nothing to do with this.
Some other application on your system has that file open, so it can't be saved over.
Photoshop is just letting you know that some other application is holding the file open, and that Photoshop cannot save over the file until that other application let's go of the file.
Turn off Caching of Thumbnails in Hidden thumbs.db Files
People sometimes report that they cannot manipulate their folders as they want to because Explorer has a thumbs.db file open. Windows 7 apparently generates these files for compatibility with older software that may expect such files to exist in folders with, for example, photos in them.
The good news is that (with Windows 7 Professional and above) you can disable this through the Group Policy editor:
- Click the Start orb
- Enter gpedit.msc in the search box and hit Enter.
- Expand User Configuration - Administrative Templates - Windows Components.
- Click on Windows Explorer.
- Right-click the entry "Turn off the caching of thumbnails in hidden thumbs.db files" and choose Edit.
- Enable the setting.