OK now I’ve been surfing the forums and have found the following snippets which may help sort some of the issues with Safari beta 3.
Firstly make sure youve installed the Apple fonts.
Next navigate to program files / safari and rename the safari.resources folder i.e. "safari.resourcesx"…
Start Safari (it wont work).
Rename the safari.resourcesx back to its original state.
Go into the safari.resources folder and rename/delete the 2 font files to something else.
Now run Safari.