Hello,
Have you checked the Monitor window? There are three tabs near the top of the screen: Search, Monitor and Library. Click on the Monitor tab and when a file is being uploaded from your computer the name of the file will appear in the white space underneath where it says Uploads (0 Active, 0 Queued). It will say what the file is, who is downloading the file from you and other information such as which version of Limewire they are using and if they have Chat enabled or not. Hope that solves the problem.