Error: TIDE project already opened

This is a problem caused by Windows file permissions.  

The default folder that TIDE use for creating new projects is under the TIDE installation folder.  TIDE creates a temporary file called "tide" with no extension; this file is a flag for TIDE indicating that the project is already opened.

What's happening is that when TIDE closes, the file is supposed to be deleted, but due to permission rules, Windows does not allow the removal of the file.

There are two ways to prevent this problem, first is to run TIDE as Administrator, second is to move the default project folder outside of the Program Files directory, which is a system directory that Windows will have stricter permission requirements.