logjam pops up a dialog containing the text 'GtkSpell error: enchant error for language: en' twice during startup, and once again after making a post. Seems to function ok though despite this.
Here's why this is happening: The old default for logjam's spellcheck language was "en", which worked on old gtkspell. New gtkspell uses proper LOCALE settings, for which "en_US" is correct, not just "en". This gets written out the first time logjam is invoked, in ~/.logjam/conf.xml, in the "<spell_language>" field. logjam now sets the default to "en_US" for new config files, but doesn't overwrite existing settings. You can manually make the change, or remove ~/.logjam and restart.