hmmm would having "launch folder windows in a separate process" account for this?

That shouldn't affect the behavior of the tweaker.

That doesn't look like it. It should be similar to the report on the linked screenshot.
Faulting application name should be explorer.exe.

P.S. did you experience a crash? In general, an error like this (Could not load library (2xx)) is usually followed by a crash of explorer, but not always.

Sorry, I should have mentioned it.
You can find the crash report in the Event Viewer. Look here for instructions:
How do I find event logs when a program crashes?
Thanks.

Please provide a crash report.

Closing as a duplicate of:
http://tweaker.userecho.com/topic/142187-it-would-be-really-great-to-have-the-possibility-to-always-expand-groups-with-more-than-1-item-and/

Thank you for the positive feedback and for the donation!

That's already possible with the "multipage_wheel_scroll" advanced option. See the help file for more details.

The improved version is not a standalone program, it's a patch. I thought there's no reason to complicate things just to replace a single icon.

Yes, it should be located in the same folder as the tweaker's executable file, and should have the same name.
Also, thank you for the donation!