As in, in the command spot (sorry dont know proper name for it) it shows it rendering multiple times? if so open your output window and see if its rendering different frames or just 1 over and over...also did you check your render settings to make sure you are rendering out the correct frames?it either does more than one renders
when importing an image sequenece into AE ( and im sure other programs). when you open the import file tab under the file menu, at the bottom you will see an "import as sequence" check box. did you check that?? should be why it only imported as one frame and not the whole sequencei tried that. no render. it is actually imported in after effects as an iff but the whole sequence is the first frame...