Check status string after pressing 'Import' button and selecting import file.
It should looks like this: XXXX points imported, YYYY added.
XXXX - number of lines with recognized lon/lat values.
YYYY - number of points added to the database (coordinate lays inside map bounds).

If no lines recognized (XXXX=0) it's something wrong with input file. Check it's not empty, don't use national symbols in path and filename.