I have been having this issue, found solutions and it was working but now its not again.
I just setup a new site, new wordpress new theme
I changed the con-fig file to new memory settings
I cleared the cache
All the plugin that are active except revolution slider are required by the client.
When I add a text element new or classic, I can enter text but when i am done it reverts back to the sample text or in the classic case nothing even appears.
What are other solutions I can try, and will this be fixed soon?