No side menu

When posting I lost my side menu and also all the aother post on the home page.

Now there’s only the 1 post and no links to see the others, in fact there’s no navigation.

I tried upgrading using the same version 2.05 but still the same.

This has happen serveral times in the past. Previously the only way I could fix it is with a fresh install.

I really don’t want to lose my post though.

Anyone else have this problem? Have you found a solution.
If you want to take a look.
http://www.thinkhealthyblog.com

Thanks
Lambert