I have installed eclipse Kepler with Texlipse. However, the spellchecking doesn't seem to work. It doesn't mark any words.
I have already:
enabled spellchecking both in the general and the texlipse preferences
downloaded the dictionaries from http://sourceforge.net/projects/texlipse/files/dictionaries/ and set their directory as the directory for both main and user dictionaries in the Texlipse-preferences
copied the wordlists from the eclipse installation and changed the extension to ".dic" and ".dict"
restarted eclipse several times
I am also unable to find an option to start a spellcheck for the whole document, like there usually is.
I had similar problems with the TeXlipse spellchecker. To fix it I followed the instructions from https://stackoverflow.com/a/5736974/2920749 Additionally, I set the language code to en in the project settings as described here: https://stackoverflow.com/a/7064110/2920749. However, spellchecking still did not work for me under Ubuntu 12.04. I had to switch to a monospaced font to get it working.
Also make sure that the dictionaries are uncompressed. Check that all dictionary files are readable and that you have write access to the user-defined dictionary.