L shaped symbol and Purple band missing?

The L shaped symbols in the lower left and right of my timeline clips reminding me i'm on first or last frame of a clip are not visible, and the Purple band at the end of the sequence too. Have i unwittingly turned something off/on?
Thanks
Dom

View > Show Overlays or Control-Option-W

Martin Baker
[www.digital-heaven.co.uk]
Unique plug-ins and tools for Apple Pro Apps

Thanks Martin. I thought i'd already tried that. Just back from Tangiers last night, so i guess my brain is still a bit smoky?