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A new version (v2.4.7) of LoTW's Trusted QSL (TQSL) has been released: http://www.arrl.org/tqsl-download. This version corrects a defect in the Windows autoupdate process when performing the download and install of a new version. Because this defect was present in TQSL v2.4.4, v2.4.5 and v2.4.6 , those versions are unable to automatically update themselves to v2.4.7. In order to upgrade, users with those versions of TQSL installed must manually download and install TQSL v2.4.7 from here:
http://www.arrl.org/files/file/LoTW%20Instructions/tqsl-2.4.7.msi