Most of the time when I log into my blog, I find the message:
"DB Cache Reloaded Info:
caching is not enabled. Please go to the Options Page to enable it."
When I enable it through the option page, It shows:
"Caching can't be activated. Please chmod 755 wp-content folder
Caching deactivated. Cache files deleted.
Then I check the enable for the second time, It shows:
Again when I log into my blog someday later, It again shows not caching.