Fonts not validating mac
It is not recommenced to delete system fonts because many apps and websites depend on those fonts. I'd recommend to use Font Book and validate all fonts. Then clear the Font Cache using Font Nuke -- Font Nuke will clear font cache which fixes 90% font issues.
Using the Repair Permissions command repairs permissions for the operating system, but not for applications, such as Photoshop.See Disable the GPU to quickly narrow down the issue.For specific errors, see the following: If a tool in Photoshop isn't working properly (for example, the crop tool crops a tiny little gray square, or painting with a brush paints the wrong color or nothing at all), try resetting the tool settings: to get the search dialog box, type the tool you're looking for, and select your desired result.By default, Photoshop activates the tool and highlights it in the UI. Many problems can occur when you use third-party fonts, including crashing or hangs when selecting the Type tool or when making the Character panel active/visible.A bad font or fonts can also cause general performance issues when launching or using Photoshop.
Sometimes, installed fonts do not appear in Font menu.