Look at the colour of that last chunk in the progress indicator - if it's pale blue, you have very few sources for it, and only expanding the list will show the true situation. If more people did that, there'd be many fewer questions to answer on this board. It's as qm2003 said - expand the sourcelist by double-clicking the d/l and have a look, sorting into queue order by clicking on the Priority column heading. Even then, your queue position is critical - sources may be in 'queue-full' state for example, and you're not even IN their queue yet.

It's not the total number of sources that counts, but the FIRST figure, as in 12/356, where there only 12 sources out of 356 which have any data for you. However, when it comes to the last chunk, many fewer sources will have it, and if you're way down their queues, you just have to bite your nails and wait. Assuming that chunks are fairly well distributed amongst sources, then the chances of a download starting on any particular chunk is roughly equal at first. Paranoia rules OK? It's happened to me fairly often, but it's not due to secret rules eMule is using, or hidden hacks, or modded eMule clients.

Bitcomet download stops at 99.9