I experienced two different issues trying downloading QSOs from LoTW.

1. wishing to downlaod (full re-update) all my confirmations (about 10.200) from LoTW, clicking  CTRL+ Sync LotW QSOs, after waiting some time (many minutes) nothing happens and I have to abort the request, which determines that DxKeeper terminates.

2. other times, clicking "Sync LotW QSOs" after few seconds a warning window appears saying: "Unable to download from LotW: invalid request"
    WHY? What did I wrong?

Thanks

Carlo  IK2RPE