Unable to move, edit, or delete Tokens

In creating maps and going back to them I have found that on some of them I am unable to edit, move or delete the tokens.  Is this a known bug and is there a work around or fix for this? Thank you in advance.  

Is it possible those tokens happen to be on another layer than the one you're editing currently? If you have the Token/Object layer active, you can't interact with things on the Map/Background layer.

I am having the type of same issue.  Tokens are on visible on the map layer but untouchable.  When on token layer the grid disappears and 80% of all tokens are gone.  Haven't had this issue before going from layer to layer and normally things will work and be seen on the appropriate layer.  Did somehow get my tokens to be able to be used on the token layer but had a shadowed effect to it.  Once i tried to go to the DM layer to click on token to bring it to the token layer everything became unusable.  Severely disappointed with the issues as this had me cancel two session already due to roll20 bugs and not being usable. 

I don't know if those are specifically Roll20 bugs. I have not read similar reports outside of the two in this thread (and even they are not identical). Are you using an approved browser, and have you tested with no extensions active? Also, could you post a screen shot of the situation? It might help to have other eyes on it.