Oh, for the record it is 2.61 build 1 and is being used in this case at home via ethernet.
Clicking the "Add File" button on the toolbar and selecting a file seems to do nothing. Progam remains responsive, but no data transfer occurs. And oddly now, copy/paste or drag and drop is working fine with a file that gave me a problem yesterday. My downloading large files tends to be a problem at work using USB, I'll have to tinker with that a bit more to see exactly where the problem is.