A total of two methods, the first one does not work, try the next second:
The first:
plsql tables table exists, but can not see all of the information table
The C:. \ Windows \ Prefetch directory under several PLSQL DEVELOPER ******* pf file deletion, and then start plsql log in, you will find that the problem has been solved. As shown below:
The second:
Modify tables location, not the first one can be found
