Steps to reproduce :

1. Install Confluence 3.5.1 instance
2. Login to Confluence 3.5.1
3. Create a new space
4. Create a new child page
5. Insert the following wiki markup :

   !https://localhost/download/attachments/243192202/pattern.png|align=left,width=100, hspace=10!
   {panel:titleBgColor=#FFFFFF|bgColor=#FFFFFF}
   This page contains issue after upgrade
   {panel}
   
   {warning}simple draft :-){warning}

   You should see the page like below :
   

6. Now start upgrading to Confluence 5.0.3
7. After upgrade is finished visit the same page. You will get the following page :
   

Expected behavior : the text and image should not overlap after upgrade
Current behavior : the text overlaps with the image after upgrade

This can be a huge problem if customer have many pages that have similar content such as described above.