I know I'm a bit late to be mentioning this now, but shouldn't
$cfg['Servers'][$i]['MaxTableUiprefs'] instead be
$cfg['Servers'][$i]['MaxTableUiPrefs'] (not "Prefs" versus
"prefs")?
And in turn, perhaps $cfg['Servers'][$i]['table_uiprefs']
$cfg['Servers'][$i]['table_uiPrefs']?