Pre-loading web objects

I'm using Articulate Studio 09. I've created many interactions using flash CS4 written in AS3 as well as some captivate 5 files published in as3.

I've inserted them into the course as local web objects, so when published they sit inside the data folder like so:

data/webobject_slide11/flashfile.swf

The course is published for web.

When I upload the course and few, often the slides with these webobjects do not load and seem to 'stick' while loading. I see a "Loading..." message in the top right hand corner of the webobject area but it fails to load. Some of these files are very small (less than 100kb).

Any ideas as to why this is occurring and if there are any possible solutions, such as pre-loading the webobjects. 

Many Thanks for your help!