I have just activated the preferences option to output UTF-8 encoded text when exporting to latex. When generating the corresponding PDF document with the pdflatex command, the following warning is output:

Package ucs Warning: ***************************
(ucs)                You seem to have loaded inputencoding utf8
(ucs)                (LaTeX kernel UTF-8) instead of utf8x (ucs.sty UTF-8).
(ucs)                Probably you are compiling a document written for a
(ucs)                pre-august-2004 ucs.sty.
(ucs)                ***************************
(ucs)                Please use \usepackage[utf8x]{inputenc} instead of
(ucs)                \usepackage[utf8]{inputenc}.
(ucs)                ***************************
(ucs)                If you should really want to use ucs.sty and kernel's
(ucs)                utf8.def together, use \usepackage[utf8x,utf8]{inputenc}
(ucs)                to disable compatibility mode
(ucs)                ***************************
(ucs)                Activating compatibility mode.
(ucs)                ***************************
(ucs)                 on input line 71.