We have a shared workbook has been acting up lately. It is used primarily by
2 users.

When we went to tools/sharing and looked at who was logged in there were 7
entries. 2 were from the current day but the other so-called "users" were
all of one particular user with dates ranging from a week old to 3 months
old...inactive sessions that excel thinks are current sessions/log ins. What
would that user be doing wrong to be prevented from logging out of the
workbook properly? Why does this spreadsheet think this user is logged in
when clearly he is not? Is this a common excel shared workbook problem? Is
it O.K. to remove the stuck sessions / logins and if so will removing them
have any affect on the database?