After upgrading from 3.0 to 4.0, the Email preview window, Source code window, and Conditional content window in a BBIS email message cannot be resized.
If editing HTML source code directly, you can copy/paste into an editor of your choice to make updates. When finished, re-insert into the application.
Steps to Duplicate
1) Go to Email > Messages > Add a new message or edit an existing message 2) Go to Insert > Condition content > Add a Condition Block Name > Click Insert > Add Condition 3) Notice that the outer window cannot be resized. 4) Click Cancel, then Go to View > Source Code 5) Notice that the window cannot be resized. 6) Click Cancel, then Go to View > Preview. 7) Notice that the window cannot be resized.