mhonolog on "Can't insert media to a page"

Hi i have problem. Recently i can't seem to insert media to a page. I can normally upload it and i can see it in Media library, but i can no longer insert any media to a page(tried pdf,gif,jpg..). This already happened a few days ago, then a day after that i tried again and i could insert media normally. Now i have the same problem again. Before, i uploaded and inserted lots of media with no problems at all. The last time(a few days ago) it started to work again i did nothing about that, it just started working again on its own. I googled it and it seems that really a lot of people have a similar problem :( I did some fixes i could find like deactivating plugins and clearing browser cache/cookies but nothing worked. I'm really down about this, like i hit a wall with my head, my boss is expecting news about site progress and i can't seem to even work properly..
Can anybody help please?