This release has an important bug fix for the metadata download. When metadata was downloaded using libcurl it was not treated as binary data. If you used one of our binary installers or if you built Leksah with the -flibcurl flag then it is likely you have bad metadata files. To fix this please install Leksah 0.12.1.2, then delete your ~/.leksah-0.12/metadata folder to force Leksah to download the metadata files again. The first time you run leksah after doing this it will take a while for leksah to update the metadata (you can track its progress by looking in the metadata directory). If you choose to generate your metadata locally or you used wget to download (the default if you cabal installed leksah) then your metadata should be ok. There are some other bug fixes in this release including one for metadata generation for users with lots of .cabal files (some lazy IO was leaving file handles open). Source is in Hackage and https://github.com/leksah Binary Installers Use "ghc --version" to work out which one you need. OS X http://leksah.org/packages/leksah-0.12.1.2-ghc-7.0.3.dmg http://leksah.org/packages/leksah-0.12.1.2-ghc-7.0.4.dmg http://leksah.org/packages/leksah-0.12.1.2-ghc-7.4.1.dmg Windows http://leksah.org/packages/leksah-0.12.1.2-ghc-6.12.3.exe http://leksah.org/packages/leksah-0.12.1.2-ghc-7.0.3.exe http://leksah.org/packages/leksah-0.12.1.2-ghc-7.0.4.exe http://leksah.org/packages/leksah-0.12.1.2-ghc-7.4.1.exe