all is good then images no longer showing

Hi,
I have been setting up several gallery plugins over the course of the week.
All was working well. Images were showing in IE and Firefox.
Today I modified one existing gallery and added a new one.
Now for these two galleries, I get an error message in Firefox "Thumbnails slider is too wide..."
and images don't show in IE.
The rest of the galleries work very well as before.

Is there a limit as to how many galleries we can add?
What could cause this error all of a sudden? I didn't change anything at my end.I just went in as usual and proceeded to update one of them and add a new one.

Thanks.

Never mind.
I found the problem.
When I copied the module, I forgot to change the directory of the new images.
So obviously the images could not be found. Doh!