On Fri, 3 Oct 2014, Jürgen Spitzmüller wrote:
Not possible, AFAIK: http://www.lyx.org/trac/ticket/9207
Jürgen, That's too bad. Something changed in version 2.1.x that took tab movement away from tables. Perhaps that change can be identified and reversed. Also, after completing text (such as column headings) I need to press the Tab key 3 times to move to the next cell. Both these table behaviors apparently are new. I hope someone can fix table navigation in the next release. Thanks, Rich