Solution
This behavior is generally caused by an element of the project, such as a dependent VI or library, being locked or noneditable. It may also be associated with project items that load with
conflicts or warnings meaning that LabVIEW cannot find or is not certain what file to load, so it does not know how to save it.
In order to track down what file is causing this problem:
1. Check if there are any
warnings or
conflicts in your project and address them first.
2. Go through the files stored in your project and
check to see if any of them are locked. This can be done by opening the Properties dialog box and checking the "Protection" section to see the lock status of the file.
3. If the option is there, try to save the project using the
File>>Save for Previous Version... option and select the same version of LabVIEW as the one you're currently using. You should be able to save the resulting project files using the
Save As... function.
4. If none of your files are locked and you're still unable to use the
Save As... function, try manually removing files from your project to see what files are preventing the
Save As... function from being used. If you remove a batch of them and
Save As... is working, start adding VIs back to determine which VIs are preventing the project from being saved.