I have PSE 10 running on Lion. The only thing I can't seem to do is get my raw files (pics) to load directly from the organizer into the raw software instead directly into the editor. Therefor, I can't edit in raw. This copy of PSE 10 was downloaded from Adobe.
I have never used version 7 so am not aware of exactly what the issue is. I have not had any issues with the appearance of lettering in Elements 10. Besides, the newer features of v9, v10, etc. make upgrading worthwhile, I suggest.
YES... you can resize any and all pictures. I go to YouTube and search how to do things on PhotoShop Elements. In the YouTube search type "Photoshop elements 10 resize" you will find many videos to walk you through and more!
If someone is missing from the photo, or you have two photos where not everything is right, you can put the two together. It would require selecting the part you want from one and moving it into the other. I taught this as a fun project in my Computer Art class where the student would have their picture taken and then insert it into a famous place from Art History. (Like climbing the pyramid in Egypt). We used the full version of PhotoShop, but I have a friend who does it with Elements all the time. Just do a file>open for each photo and go from there. I would have to research the directions for Elements but I know it can be done.
I'm no digital geek, but try a different memory card, or maybe a different kind of card reader. I had the same thing happen to me with a Nikon D300, and once I switched the card, it was all right. Worth a try, anyway.