Might have been better to post in the mac section. Try deleting your LW prefs folder whilst LW is closed. It doesn't sound like a connection problem from the brief details you have supplied. Also, do a safe boot & repair permissions. Could also try Tip: Purge the Downloads Queue! (click on blue link)

Also after deleting LW prefs folder, open LW & go to the preferences settings & under Advanced > Performance, disable all options on that page.

BTW if you upgraded from basic to Pro, it's usually recommended to delete your LW prefs folder, otherwise Pro sometimes behaves oddly.