Cannot show configure dialog for "CVS Reader" node

You could try a clean start. I recently experienced some problems on a later version of MacOSX. Also you might try to create a new knime workflow and a new CSV Reader node

KNIME start with -clean option in knime.ini

Under MacOSX you would go to the programs folder, right click on the KNIME symbol, show package content. Then Contents/Eclipse to find the knime.ini file.