Topic: 2 of my 4 viewers showing x's

I've been using simpleviewer on my site now for a year or so. I have a wedding gallery page that has pop-up links to four separate s.v. galleries.

I've never had a problem with my galleries before now. Here's the issue: two of them work, and have been working since I put them up, recently I added two more galleries, the pictures are showing green x's.

I've checked the coding, the file names match, I uploaded the swf files, and all the other files I was supposed to.

I know it's hard to troubleshoot without a link, but as I am a new member I can't post one yet.

Does this make sense to anyone? Thanks in advance for your help!