Sequencher can launch or go into Viewer Mode (no printing, saving, copying, exporting, reporting) for any of the following reasons:
If your automatic evaluation license of Sequencher fails.
If you have a standalone license and your license is tied to a USB hardware key and Sequencher has lost communication with the key, then you’ll be switched to Viewer Mode. Check to make sure that the key is still plugged in and lit. Try restarting Sequencher.