Hi, Please check that the database is correctly set up. Open Setup / System - check that Database type SQLite is checked. - click Check button, it list the tables and must finish with "All table structures exist"
If you get the ephemeris file from http://www.minorplanetcenter.org/iau/MPEph/MPEph.html be careful that typing halley in the search box return elements for asteroid (2688) Halley! You must type 1P to find Halley comet. Select MPC 1 line for element output. After that you get a file with following content: 0001P 1986 02 09.7487 0.595037 0.966720 111.9965 59.0433 162.2235 20100723 5.5 3.2 1P/Halley Click Setup / Solar system / Comet / Load MPC file / use local file / click the folder icon and select the file you just download, eventually select All files if you not see your file. click the Load file button, it must say Total number of comets: 1 in the message box. Then if you just type halley in the search box it will again find the asteroid (2688) Halley. Use Advanced search and check Comet to find it Patrick
