Can you list the plugins that you have active?
Sure.
Akismet
Anti-spam
Blogger Importer
BlogSense Connect
BrainHost Website Configuration
Dynamic Content Gallery
Easy Privacy Policy
Feed WordPress SEO Fix
Google Analytics for WordPress
Hello Dolly
Jetpack by WordPress.com
Magic Action Box
OptimizePress
PG (Unified) Page Templates
Related Posts
Traffic Counter Widget
Use Google Libraries
VSTEMPLATE-creator
White Label CMS
WordPress Database Backup
WordPress SEO
WP Robot 3
WP Super Cache
WPtouch Mobile Plugin
None of those leap out as being problematic from what I know, but there are some you could deactivate anyway:
Anti-spam (as you have akismet)
Blogger Importer (as it as done it’s job I assume)
Related Posts (that should be part of Jetpack?)
To be clear – you write a post in the editor that is say 5 paragraphs long, you hit Publish and not all 5 are then shown?
And if you then edit that post you find the content has completely gone?
Is this just posts, just pages, or both?
I’m pretty sure this will be a plugin interfering. The only way to find out is to deactivate a plugin, make a post, see what happens.
If the post is still affected – that plugin did not do it.
If the post is good – whatever you deactivated is guilty.
These plugins will not be doing it:
Akismet
Blogger Importer
Easy Privacy Policy
Hello Dolly
Jetpack
WordPress Database Backup
WP Super Cache
so I would start with the others.
When did you first notice this, and what do you recall was the change you made right before that?