Unable to resize marker text box after initial customization?? (SL2)

Hmmm ... thought I understood how markers worked, apparently not or there's a bug.

I insert a marker, add title and text, resize the text box etc. no problem. However, after that intial customization I can NOT return and resize the text box? No matter what I try I can't get the resize handles to reappear. I can reposition the text box, add/delete text, but can no longer resize it?

Am I missing something ultra-fundamental here?

Thanks!