You guys close threads too prematurely!!! I'm having the same problem, and I don't have that plugin installed (share this). The ones I have installed are
NextGen
.html on pages
Page links to
TGFI.net SEO
Tiny Contact Form
Formbuilder (yes I need both forms)

Can't really eliminate any of these because the site's pretty much complete, but it would good to know next time. It's happened on one other site too. This has only happened with the newest version of Atahualpa. I had several of the same plugins on a prior version with no problem.

On another site I'm building, it's only got Formbuilder on it, and I deleted it. Voila! The editing returned to the Atahualpa theme.

Note to self and to others: install this plugin at the VERY end of your development cycle, otherwise it will cause a great deal of frustration.

Krystna,

What version of Formbuilder were you using? I was absolutely just on the verge of installing 0.80 when I decided to check it out here.

I just faced this issue on 3.4.9 and it took a while to realize that I need to refresh the browser in order to get the expansion cursor to appear. It's consistent for me, I cannot expand fields until I refresh the theme options page. For those who haven't figured it out, you need to hover the cursor over the far right corner of a text box until the cursor changes to a resize grippy, then you can pull it to whatever size you need.

hope this helps anyone else who finds this thread.

i'll add some keywords: expand text area editor css inserts increase multiple lines