This problem exists in 1.5 final. I think I verified this correctly with a clean, unmodified, version of 4images and the default template set.
The following html template files contain the <textarea> tag and are affected:
comment_form.html
member_mailform.html
member_uploadform.html
member_uploadform.html
postcard_create.html
Here is a screen shot to show the problem:
As you can see, half the template is "cut off" from the edit box and I have two strange buttons.
Anyone else have this problem?