Hi jxp,
Thanks for your input. I can confirm this problem in the current version (1.59) and will be fixed in the next version.
For a temporary workaround, make sure the document is already modified before using the spell checker (does not need to be any permanent alteration, just write a letter and delete it)
This problem only happens on non-modified documents.
Sorry about this,
Thanks,
André Santos
Carthago Software Support
http://www.carthagosoft.net