Let me record here that the problem is indeed fixed. Well done!

Yep: that seems to be it. I ran the 'debug 3' version of the tweaker (henceforth 'DB3'). It did not crash - but it does not crash every time. Then I disabled that option. Then did the following, none of which produced a crash: closed the program, re-ran it ('it' being DB3); closed and re-ran it again; closed it and reinstalled DB3, and ran DB3 again.

Log.

I had a bit of trouble getting the new version to crash. Perhaps the portable version was still running. (I need some version running - for, I cannot live without the Tweaker!) Anyhow, after installing it for a second time, it did crash. Log.

Thank you. It crashed as soon as run. Log.

I add that, at present and when run manually (as against on boot, which I have not tested with the portable version), the portable version continues to work without issue.

'I don't believe that the portable version or file permissions have any effect on this problem, it's more likely that you're just lucky and don't see this problem for now.' You would seem to be right. For, I booted just now and saw the error again. Yes, please do send the debug version. (I am sorry for the late reply. For some reason - I will investigate - I seemed to receive no notification of your reply.)

Solved - though the user might need to solve the problem herself, in that the new Windows build might be the cause of the problem. Also, the Explorer crash seems an ungraceful, unhelpful way to deal with the cause of the problem. I used the program Windows Repair to reset the file permissions of default items to default. After doing that, the installable version of the Tweaker worked fine!

First I should say: the above anonymous comment is by me.

I find that the portable version works fine when run at boot. However, I should like to be able to run the installed version.

Thanks. I do not know whether the file explorer crashes. When the tweaker runs, automatically and post-installation, the tweaker window appears and something happens to my tray icons. To wit (er, I think): all non-system icons that were showing get moved to the 'hidden' section. In all other respects, so far as I have noticed, things work. Do you still want me to try to use ProcDump?