When i submit a question or an Answer i  get a white page as result...

but the Question or Answer is saved in the database.

I use the MemCache method and i see that when i use the Joomla Cache system i receive the right page after Question submit.

but when i activate and use the Memcache in my Joomla i receive this white page.

CA 4.1.3 - J 3.4.1