Juan, if you would take your car to a garage and tell the mechanic "My car isn't working properly, what wrong with it?", would you expect an answer?
Before anyone can tell you what's wrong, you have to be as specific as possible. Like: do you open these databases simultaneously, do you have user profiles, do you close these databses before closing Cardbox etc. etc. And most important: what did YOU try to solve the problem? People on this forum are not magicians with crystal balls.
OK. I closed all data files. Closed cardbox. Checked user profiles and found I didn´t have any. Blindly went through all the menus trying to see if I could find any options which could help me restore the edit functions. I then hit on Rebuild file. Did that!! and behold just like magic my edit buttons were back. So thank you Charles. You were right of course I should not have given up so quickly.
Maybe you can help me with my next query. I will not post it here but as a new post so it can help others.
I find the same problem and it is normally because for some reason only known to God and geeks the connection to the LAN is not quite right and the PC needs to get back on line. It sounds like the same in your case.