"Out of memory" problem when I try opening "Answers"

Hi !

I have installed Q&A plugin on a 3.8.1 wordpress, with only a few pages now and less than 10 plugins. All functions look OK except when I try writing a first answer.

# When I click on “Questions / Answers”, the system answers with :

“Fatal error: Out of memory (allocated 64487424) (tried to allocate 45 bytes) in /homepages/38/d153135156/htdocs/erafr/wp-includes/post.php on line 628”

The effective memory allocation is 90M (although the dashboards reports 256M …?)

# Second problem

I cannot grant access to support via the dashboard plugin : it says :

“There was a problem enabling support staff access. Please check that you have Admin permissions and that this site is enabled in the API.”

N.B. Site is e-ra.fr

Thank you for help.