Stupid Collages...

I am so frustrated with the collages I've been putting on my blog lately. The first few I put on, I've had no trouble with, but then at Christmas - it started happening. I'm sure you've noticed it. You can't click on the collage to make it bigger. You can't even see the pictures. What am I doing wrong? I don't think I changed any preferences or anything. Anyone know what I can do? Your help is much appreciated.