I can see that there was a kind of similar issue in the past, not sure if this is still somewhat related or not:
https://www.intel.ca/content/www/ca/en/support/programmable/articles/000079443.html
Description Due to a problem in the Quartus® II software version 12.0 SP2 and earlier, the Quartus II GUI may freeze when adding signals in the SignalTap™ II Logic Analyzer if your quartus2.qreg file contains an invalid statement.
Resolution
To work around this problem, open quartus2.qreg and remove any lines that contain the text "Node_finder". The quartus2.qreg file can be found in the following location:
- Windows 7: C:\users\<username>
- Windows XP: C:\Documents and Settings\<username>
- Linux: ~/.altera.quartus
This problem is fixed beginning with the Quartus II software version 12.1.
Contributor
