Dennis,
The issue is still occurring. Below is a link to a video I made tonight illustrating the problem.
TQSL 2.5.1
LOGic v9.1.47 (also occurs in 9.1.46)
Win 10 Home 64-bit, v1909 latest update, Lenovo i7-4740, 3.4GHz 16Gb Ram
This worked until the update where LOGic was changed to accommodate TQSL's change in running with Administrator Rights. I think that was either 9.1.45 or 9.1.46.
Currently the only way to close the LoTW Upload window is to close out of LOGic and re-launch.
https://youtu.be/TsOSNi8I7gE
73 de Brad, N8GLS
Update 03Mar: It was LOGic v9.1.46 that had the TQSL v2.5.1 Administrative Rights fix.
Prior to v9.1.46 LoTW Upload worked fine.
Brad