Well, Ghost, I deleted this link from eMule and then I added it again, and it showed about 7 sources and downloads, although rather slowly. So maybe really a problem with my configuration (I know I have low ID issue).
Check your firewall logs. Maybe it is blocking/killing all connections not initiated by your computer - this means connections from the sources for your files.
Often it is necessary to create two additional rules in the firewall configuration, one each for TCP and UDP allowing incoming access for eMule.exe on the specified TCP and UDP ports.