3. Check the HTML for the missing items in the Template manager page, does the HTML show up but just not display? (the HTML does appear to be there, but not visible)
That tells us the data is there on the page but something is preventing it from showing, I’d bet my boots that it’s a javascript issue (see item 5)
4. Do they show if you hide the sidebar? (the sidebar is not and does not open)
The sidebar open/close is done via javascript, again it looks like javascript is missing
5. Double check that you uploaded the control panel files correctly (especially css and javascript files) (when you say upload correctly what do you mean?)
Check that all files have been uploaded correctly to these folders:
/themes/cp_themes
/themes/javascript
Try reuploading all the files in both those folders from your 2.7.0 distribution so we know you have the correct CSS and Javascript file sin place.