The check labels tool located in the layout menu can be used if you suspect that there may be a cad corruption. Also can be used if your trusses that you are selecting is not matching what is coming up on the view truss screen.
How to use this tool is as follows
1. Click on the layout tab and then click the check labels.
2. Click the ok button and this will check labels on all levels of your job.
3. If this doesn't work you may have to delete all labels and relabel the job.