Welcome to our community, Jeanne
Indeed Captivate 3 projects *DO* actually have a "size limit". But I'm unaware of any specific byte size that is to be concerned about. Typically we recommend folks keep projects at somewhere between 50-65 slides as a "rule of thumb" guideline for an upper limit.
There are a great many factors that come into play with this. Things such as:
Authoring PC Specifications (available memory, hard drive, processor speed, etc.)
How many objects are on each slide
Generally you are able to split things up and perform what is called a "Daisy Chain" approach. This is where one project ends and another is launched as the ending action. You may also specify that the end action for projects be to open the SWF that contains the menu.
Hopefully this helps... Rick
Helpful and Handy Links
Thank you so much for this great information. I'll try the daisy chain approach.
I tried to start a project at the end of another project (daisy chaining as you mentioned). I went into Edit>Preferences>Project>Start and End and used the "..." in Project End Options to locate the .SWF file of the project I wanted to start next. However, when I publish & run that first project, I get the error "Cannot find..." and it lists the file path that I designated. I then tried to like to the CP file of the project. That just opened a blank IE browser window. Help! Do I need to have all the .SWF files in the same folder maybe?