Hi Robin,
Unfortunately the sticky posts is not working properly. I just tried removing and adding back the ‘sticky’. At first it was at the top of the Spectroscopy forum with the word sticky next to it, but as soon as another post was added the word ‘sticky’ vanished and it moved down the list.
I have added it to the list of Website Operations Team tasks, though it might need to wait until the next website upgrade to fix it.
Cheers,
Andy