@fgdorsemaine: It looks like you are running out of memory far below the limit set in php.ini.
On the Wordfence options page, under the Other Options section, look for “How much memory should Wordfence request when scanning”, and set it to 256, if it is not set already.
If it was already set, check your .htaccess file, and make sure that there is no memory limit set there. The memory could also be limited by another plugin, but this should be rare if it’s not something you chose intentionally.
Near the bottom of the Wordfence options page, you can also try the link “Click to view your system’s configuration in a new window” and look for a section labeled “Additional .ini files parsed” — sometimes this will list other files that have been included, which may set the limit. (In some cases, there may be a lot of files that would not be relevant for this issue.)
If none of these help, you may need to ask your host to increase the memory your site can use. They might be limiting memory in another way, outside of php.ini.
-Matt R