Yes, this is not a DT3b2 issue. Moving image in DT3 is exactly the same as DT2 but it has never been easy for me to size (impossible) or move (a bit tricky) images. I’m aware that it’s about the TextEdit, not DT.
The strange behaviour of sticky images happened after I ran a script to reformat my rtf/rtfd annotation files. Batch reformatting font (but retain bold and italic) for rtfd files.