Jeff Pritchard [25.02.2007 02:26]:
I'm getting this never before seen error quite a bit all of a
sudden: marshal data too short
what helped in my case was to set the type of the 'data' column in
the 'sessions' table to 'longtext' (or 'mediumtext') instead of 'text'.
note, however, that this is specific to mysql and if you're using
migrations you need to set it manually: t.columns << 'data longtext'
(at the end of your 'create_table' block).