I just upgraded one of my sites to SP V5.7.5 from V5.7.4. The upgrade went ok however on the forum page there are these messages on the bottom:
Warning: Illegal string offset ‘id’ in /xxx/xxx/public_html/socalclubhouses.com/wp-content/plugins/simple-press/forum/content/sp-common-view-functions.php on line 3646
Warning: Illegal string offset ‘name’ in /x/xxx/public_html/socalclubhouses.com/wp-content/plugins/simple-press/forum/content/sp-common-view-functions.php on line 3646