iphone not automatically syncing when plugged in?

[mdwsta4]

i just upgraded to snow leopard this morning and decided to sync my phone this afternoon. usually when i plug it in, it starts to sync automatically. now i have to actually click the 'sync' button. in addition, the 'automatically sync this iphone when connected' option on the summary tab is grayed out.
so... how do i get it ungray so i can click it and have the phone automatically sync?

 

[Moi un Mouton]

At the iTunes menu bar, go to iTunes > Preferences.

Under the Devices tab, is "Disable automatic syncing for iPhones and iPods" selected?

(Quoted from Apple Support Forum)

 

[mdwsta4]

i ended up doing a restore and it works fine.