Product review (5 stars): Inability to fit resolved!
I actually started to return this filter because it would not fit.  I'd seen other similar problems in reviews.  But it turned out that the tip of the prior filter had actually come off and was stuck where the filter is inserted into the refrigerator thus blocking my ability to insert this new one.  One I realized what happened, it was easy to remove tip from the old filter by using a pair of long needlenose plyers.  I suspect I'm not the only one that has had this problem.

FYI - the old filter that had the removable tip was made by Royal Pure Filters.  This one does not appear to have the same problem.