Captivate 5.5 - Imported Swf Files are Invisible

Hello,

When importing certain swf files they are invisible when running in Captivate.  I might mention I had no problem running these same swfs several months ago. 

I have double checked all Captivate settings and options, searched the Net and this forum, and it would appear that no one esle has experienced this problem?

Any ideas I could try will be appreciated.