This applies to Mozilla 1.7.12 too.Drag it from browser and drop it directly into TC pane ... and you got a 0 byte file. Sad
Drag it from browser to the TC entry at the task bar first, wait until TC appears ... and drop it to the TC pane then => you get the full file Very Happy
In Mozilla (I don't know about FF) the opposite is the case if I drag a file from the browser over a zip file in the TC pane. Then it gets packed alright if I drag it directly, but if I drag it via the taskbar button then TC gives the error "Cannot open file for reading"