Hello I up graded my site from 1.38 to 1.5.1 since the upgrade sales dropped dramatically to almost 0

In the back end Admin Panel the product description box is blank yet product descriptions show for the products on the main web site fine?

I cant change or edit any information in Admin Panel for Define Pages Editor or Ezy Pages all the description boxes are blank yet the information is showing on the main web site? Such as the front/main page, contact us etc?

Meta Tag descriptions in Admin blank some show and some don't?

When i place a description in for a product in Admin i get Capital A's all over the place?

I did previously have a Pay Pal issue that's why i upgraded the site to 1.5 but this was resolved by a new IP address.

My site has not functioned correctly since the upgrade to 1.5.1

Should i go back to the old version 1.38 or does any one have a solution please? Thank you