The search pane should have three panels: an upper one for results, the lower for downloads, and a left one for search entires/filters. Each is supposed to be have a way to be manually resized.

try downloading one of the free files from http://www.magnetmix.com/index.shtml

I think the Linux version handles magnet links properly now, so that will at least show if the download results are working.

(I'm on OS X, so hope this helps until a Linux user sees your question)