Thanks for all your help.
I have installed 6.2 as requested and attached a revised copy of the log files.
I wasn't too sure what you meant by basic mode but I assumed, from your other comments, that this was because I had disabled Aero. The Desktop Window Manager service only failed once this time and, after I restored Aero and ran DWM.exe all appeared Ok on that issue.
However, the major problem when using 6.2 on the new monitor was screen refresh. A black area, parts of the underlying window or the desktop showed in the active window. Sometimes a restored window would contain many artefacts. The main screen continued to display all these windows normally.
I have not had a problem with other functions, the PC remaining usable before rebooting any previous time I've installed DisplayLink. The machine seems to run normally until I reboot. The same symptoms, low res etc, occurred when I rebooted after installing Version 6.2.
One other point I forgot to mention before - once the problem occurs, it is difficult to restore the PC as the Nvidia driver installation then fails to recognise that a GTX card present. I have taken to using Windows System Restore to create a manual restore point before commencing to install the DisplayLink drivers, but even this caused problems on one occasion - I eventually managed to restore in safe mode!
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