Problem with create post in home page and sql fail in audit

Hi, I am new on UNA (but before with dolphin), Im loking for the configuration but I have 2 problems:
- at the home page, in the block system: create post "get_create_post_form", I cant put text (check image), the icon stay, its like it loads but cant...
- Also in the audit I have "thread_cache_size=0 _FAIL (must be >0), check image, is it a big problem or not? because with TMD cloud I cant change that in mysql
Maybe you have some ideas