Where can I adjust the size of the edit window for the html block? I was able to adjust the textarea box where the code is within the window, but not the window itself. Any help would be greatly appreciated!
I think that those btInterfaceWidth/Height variables that Scott mentioned are only used during installation of the block. If your block is already installated, then try changing the width and height within the BlockTypes table in your database.
protected $btInterfaceWidth = "400";
protected $btInterfaceHeight = "170";
increase the second one to whatever you see fit.