Despite what the isp people from the front desk told you (often they don't know), there's a chance you're being filtered by a p2p filter program that targets p2p apps or specifically LW. This might not be the case but it would certainly explain your sudden turn around in fortunes using LW.

(Sorry I missed you earlier mentioning you had a True report to incoming.)

I'm a bit short on ideas now about what to try. The problem is only affecting your use of LW.