Some players unable to see tokens

Hi all, My players returned to a map that some of them had visited before. Dynamic lighting is on, daylight is on. I added my six players to the map. Three of them can see fine. Three of them can see nothing. Vision is on for all players. I added myself as able to control one of my blind players' tokens, and when I log in as a player, I cannot see either. It's as though none of those three tokens are on the map at all. Interestingly, the three players who have been on this map before are the ones who can see. The three who are here for the first time, cannot. I also tried giving one of my blind players control over one of the characters who have vision, but that doesn't work either. Any ideas? This one has me stumped. We ended an hour early tonight because of this, and I'm hoping to get it fixed before next week's game.

Hi Kevin,  The players that cannot see moved their tokens yet?

They couldn't even see their tokens to move them. I did figure it out overnight (thank you subconscious for clearly working on this while I slept). For some reason, the players whose character sheets were made later do not automatically associate with their tokens when I drag them from the left bar. I have to go in and manually change them from generic to their character names. Normally, when I prep a map, I drag the players on in advance and set them up for combat, so I usually make that change before the players ever log in. This time, however, the players took a bit of a left turn on me and headed somewhere I wasn't expecting. I quickly dragged the tokens onto the map without even thinking of that. So as far as Roll20 was concerned, those players had no tokens on the board. I don't know why this happens. Now that I'm more aware of it, it's an easy fix, but it is sort of annoying.

The final step of editing tokens is to open the Character, edit it, and use the "Use Selected Token" button to save it to the "master token on the sheet".  You can think of it this way, any token you edit on the map is a copy of the master, not the master token itself. So you need to update the token that is contained in the character.  It is done this way because you could have multiple changes to tokens to represent variations of a single NPC. For example, different AC, health, etc.