Is there a list of illegal characters?

A long dash in an excel attachment, such as –, will cause excel2table to fail to render the topic, giving instead the error:

Foswiki detected an internal error - please check your Foswiki logs and webserver logs for more information.

Wide character in memGzip

-- JacobEtches - 03 Apr 2012

Smart quotes and ellipsis (...) are also illegal.

-- JacobEtches - 04 Apr 2012

This also happens in the last version (1.1.5), when using utf8 and the http compression is enabled.

To repeat it, see the topic history in a foswiki installation with locale support enabled, and compare revisions. Foswiki creashes with the same error message.

Also, there is a comment from MichaelDaum in http://trac.foswiki.org/changeset/4065 about not supporting wide characters in render.pm

As workaround, go to Configure>Tuning and disable Http compression.

-- StefanosKouzof - 03 Oct 2012

Another work-around is disabling UseLocale. This is pretty buggy in Foswiki anyway and it is actually strongly recommended to switch off UseLocale.

-- MichaelDaum - 02 Jun 2014