After today DEDECMS V5.6 upgrade to DEDECMS V5.7 and upgrade 5.7 SP1, found that generate Home, columns, content pages are blank, nothing happens, today announced a solution.
It found that each template calls over Html2Text are blank, the statement will call this function can be deleted to generate normal.
Solution:
To backup files before the upgrade found: inc_fun_funString.php files in the / include / inc directory, upload this file to the next / include / inc directory of the newly upgraded website, the problem that is solved.