PLEASE help, Profile Pictures

I just installed elgg and i'm LOVING it, just having 2 problems with members uploading profile pictures.

1. If a member puts a photo larger than about 600K it will give me a fatal error message saying there is a error in line 898 of filestore,

2. (BIG problem) even if members get around this and upload a pic, ALL of their friends who have uploaded a photo will share the SAME picture,


Please help as I plan to launch this site for over 200 users, thanks!