I have just recently started using MS Office 2013. In the past, it was EASY to create a table and then highlight a column and hover over the vertical line between columns, the mouse pointer would change to the nifty little arrow line arrow pointer, and then
you could drag the column and change its width. it was easy, intuitive, simple, -- a total no-brainer.
Now in Word 2013, that no longer works. I cannot drag the column widths, and I cannot change the width at all for the columns in my table.
I have looked for settings in many places, but I cannot seem to get the table to allow me to drag and resize the columns in any way.
It is very annoying that such simple intuitive functionality from past versions does not work anymore in Office 2013, Word 2013.
Stefan's answer is only a partial answer. no idea why the tables were locked, but the long urls was a side issue related issue.