You are welcome :)
I think, the problem is inside your database if I read your story. Maybe there are some conflicts between your theme and plugins? You can check this to deactive all your plug-ins and active one by one, until when the problem is solved.
Case 1
You can move your WordPress website to another databse. Export all your pages and post. You can find this option by your general settings. There's an option with import and export, use the export version and select everything (in the Dutch WordPress version the upper option). Create a new database with a password and update the database user and password with the new one. Go to your general settings and click on import, to upload your pages and post what you download earlier from the old database. You have still active all plug-ins what you use! If it's works for you, you can remove the old database.
Case 2
Download your post and pages (like the same way as here above) and store it on your computer. If you need, you can download your theme, photos and plug-ins to your computer. Default folder is: wp-content/themes/, wp-content/uploads/ and wp-content/plug-ins (only by default installations).
Remove also your database. Install a new version of WordPress with a clean database. Upload the theme, photos and plug-ins by filezilla to your website. Active everything again (all plug-ins and themes). After that you can import the file (post/pages).
Hopefully it's work for you. If you have still problems, please let me know!
Warning!! Before your change something, please make a back-up of your website and database! I am not responsible for errors or demage.