I don't know if this will help anyone else, but I wanted share my missing saved game fix, or I should say my husband's fix.
When I went to play today, my last saved game was not in the main menu. We quickly searched the forum and found this thread.
The save was in my Sims 3 saves folder, so we tried the factory reset but the save game was still missing.
So then he tried the meta.data file transfer per instructions from here but still no saved game showing in the main menu.
He then tried saving another town as a test, and it did save to the main menu but then another saved game was missing! (I save my games sequentially as I play families in that neighborhood so it's real easy to notice when a number isn't there)
He had asked earlier if there was a limit to how many games you could have in the main menu.
I had no idea and we hadn't seen anything about that being a known problem/issue.
He decided it was worth a shot. He archived/moved about 24 saved files with backups from my Sims 3 saves folder to my external hard drive.
And voila!---saved games 29 and 30 were back, completely intact, as well as the "silouette" family from the meta.data transfer we had tried earlier.
I had never heard that there was a limit to saved games in the main menu, but moving older saved games out of the folder did the trick for me!
This site has helped me out with several issues, so I thought I would pass this on in case it could help anyone else having a similar issue.