First a brief disclaimer, I have just downloaded leksah for the first time. So the issue could be due to my inexperience.
Every time I close leksah it I get the beach ball and have to force quit.
PD: Let me know if you require any other information.
OSX 10.10.5 (14F27)
cabal-install version 18.104.22.168
using version 22.214.171.124 of the Cabal library