I just updated from  DraftSight 2025 SP1 to SP4 and now Draftsight crashes upon boot-up.  The Menu/Ribbon does not even start to load and the application crashes.

To get some work done, I un-installed SP4, rebooted the computer and reloaded SP1.  Now that version crashes the same way, so I uninstalled it, rebooted the computer, downloaded SP2 and installed it.  Same results, DraftSight will crash just after the application opens.

Any ideas why this is happening after installing SP4?