Starsector 0.98a is out! (03/27/25)
Hi - sorry about the trouble! I suspect this is something system-specific, but if you edit data/config/settings.json, find "useSoftwareMouseCursor", and set that to "true", it may resolve the issue.
... however I worry about the performance loss caused by this.
Running the game in windowed mode with resolution set to my monitor fixes the issue