I am not sure whether this is a TinyMCE issue or a moodle issue but it can sit here for now.
However, in moodle 2.0 I can not recreate this behaviour... see pic below:
Does anyone have any suggestions on this... it's rather annoying, as right aligning pictures was a nice way of making a neat and aesthetically pleasing course area.
Perhaps a work around....some different html tags...or perhaps installing a different html editor? Perhaps it isn't the html editor's issue... your thoughts are appreciated...