There is a weird bug on my site that developed when I added some buttons on the homepage that link to 3 case studies (see buttons in the section below the portfolio). 

The buttons were displaying fine until I started to develop the 3 case study pages that the homepage buttons link to. 

Using the main menu to navigate between all the pages on the site,  all the buttons are all displaying properly. But when you go to the homepage and click on one of the case study buttons 2 things happen:

1. The button near the top of the page on the Case Study you linked to disappears. (see "VIEW PORTFOLIO IMAGES" button per attached).

2. When you navigate back to homepage the text in the 3 Case Study button links now also disappear until you rollover them.

Clicking between the menus and buttons has intermittent results (i.e. sometimes the buttons appear, but rarely).

To get rid of the problem I need to go back into one of the Case Study pages and re-save the text box element that contains the "VIEW PORTFOLIO IMAGES" button. Then the pages work until once again I click on one of the the case study buttons located on the homepage.

I have tried deactivating all my plug-ins and tried refreshing and restarting the browser but that made no difference.

Any ideas?

Thanks in advance.