I have 2 people working on the same website. They are using the checkin and checkout function to access the files on our web server. One of the programmers checked a few files out, then later checked them back in. The other person then tried to check them out, but a message displayed that the files were still checked out by the first user. We looked at the files for a bit, not sure what is going on. We also noticed that there were question marks in the "checkout" area of some files. Does anyone know what could be going on?