It's not the problem. That means that the position has been hidden in select menu list, but it doesn't affect its visibility in display mode. You can remove the hidden status by going to the positions section and enabling the position.
Thanks, after running some more tests I found out what is happening, I can run the "sidebar bottom" ad as long as it is the only sidebar ad being run, as soon as I activate "sidebar below visitor panel" that ad shows up, and "sidebar bottom" ad does not.
I want to place a mobile ad using packages, after reply 4, 16, and after the last reply, and also in the thread list page after thread 4, and 16.
I have three ads in the package, and I only want one ad per position (one ad on each page after the 4th, 16th, and last replies - three total per page).
The package can display ads randomly so you can end up with the same ad on multiple positions. If you want a unique ad per position, you would have to place ads individually without a package.
Select these positions:
After Post x Container
Thread list after x thread
Set position criteria "Item ID" to: 4,16,L
This will do exactly what you want. If you set this for the package and limit display to 1 and set order to random, it will show a random ad on each position but you can end up with the same ads on different positions. If you want to avoid that, simply assign each ad on those positions with different Item ID for each. One set it to 4, one to 16, one to L.