Thanks all!  I'm not intending to deflect from my original request by discussing Sims3Packs!  Sims3Packs are easy for me to work with, either actually using the game to load them, or expanding with Multi-Installer.  I just can't get the saved Sims files to show in CAS any more...I've tried removing the folder, recreating it and adding a Saved Sim file of my own creation, as well as actually reloading the game and expansions.  (There is a very good guide in MTS for this entire process, which I have followed).  The Sim files I create now will show in the game as long as I don't shut down.  I understand that most people have had no issues with Generations, but there are some who have, and it is the first time I've not been able to see those particular Sims.
 The Sims that I create now I end up saving by using the Share feature (which is creating them as Sims3Packs...).  It works, but is a little tedious, and doesn't help for those files that I have downloaded from other creators.

I use the Multi-Installer to break the sims3packs down.  I agree, I don't like Sims3Packs as every now and then I do come across one of those that will not show in the game either, but everything works when broken down into package files.  Thanks for your assistance, Kissing_toast!

Yes in both cases.  Sim files being saved in SavedSims folder.  They worked for the longest time; not certain but I think they went back when I downloaded Generations.  I tried all of the tricks I could find, from various forums and posts.  Even to the point of reloading everything!
I knew of and use the Multi-Installer.  I had hoped that there was something that could convert the.sim files to another format, as my game recognizes everything else!

Is there an external program which will let me convert sims files to sims3packs?  I have tried all of the tips and tricks to get my game to see sim files (which used to work, then stopped...) but I can't get them to show again. 

I do get this to work when I open a character and then randomize the traits, favorites and lifetime wish, even with a pre-created character which I had downloaded.  It seems to be more with the teens when I encounter the issue.  Thankfully, being mindful of this, I am able to use the mod AND create individual Sims or Families in CAS!

I like the features in this mod.  The one problem I have encountered however is that I can't save characters created in CAS.  The entire lower section of buttons becomes unusable once I click the check mark and the only way I can get out is to click "randomize", then X out.  I am not running any other mod that should conflict, having run Stones compatibility check tool.