Slides do not change with the master due to unique.
Cause:
The slides are unique; the backgrounds or fill colors used differ from the master's background or color scheme.
Solution:
To restore master format to the slides, reapply the current slide layout.
1) Select the 'View' menu and select 'Slides'.
2) Select the 'Format' menu and select 'Slide Layout...'. (The Slide Layout dialog box appears.)
3) Click 'Reapply'. (The layout is reapplied.)
