Will do, thanks.
I move the axes upwards slightly for most shrubs so that they "sit" on the planting surface in a more credible way - essentially planting them slightly buried.

@tig said:

Why do you need to move the axes ?
If the image has become a component, then select that and explode then remake the component this time setting its axes where you want - at that point the texture shouldn't 'jump' ??
Use the same name to overwrite the original...

So I temporarily switched off Anti-Virus Protector (Kaspersky) and it worked. Hooray!

Weirdly, no matter what I did (allow, remember my preferences etc etc) it kept re-prompting me.
I've had plenty of issues with it being over-zealous. I guess that's preferential to being under-enthusiastic at protecting my computer, just a bit of a faff.

Only issue I have now is that when I change the axis in the lovely new component it moves the texture around but that's not a big worry. Can sort that out myself I reckon.

Thanks a mill for your help.

@tig said:

What you have done so far seems fine.
I repeated it with your PNG and got this result attached...
My SKP was on my Desktop, but ones in my Documents folder work fine too...

The main difference seems to be your over-zealous AntiVirus tool which attempts to block the JAR files running - not seen that before !
Do you tick the box to remember the allowance ?
You must allow it to create the files [obviously], when first run you might be causing a glitch by the interruption - but after that if you told it to ignore the JAR's actions it should be OK ??

You could also try switching off the AntiVirus briefly while running the tool and see if that is indeed the culprit...
What s your AntiVirus app ?

[attachment=0:dc4tca6g]<!-- ia0 -->Capture.PNG<!-- ia0 -->[/attachment:dc4tca6g]

Dear TIG,
Know you must be so sick of answering questions on this...

So here's where I'm at:

The Image must be imported as an Image, NOT a texture. - TICK
It must be a PNG. - TICK
It must have a transparency alpha-channel. - TICK
The background pixels to be removed must on that. - TICK
ALL other pixels must be 100% opaque. - TICK
If they have any transparency at all they will also be removed ! - NOTED

Save the PNG and import it as an Image into your SKP. - TICK

Select it. - TICK
Choose ImageTrimmer on the Tools menu. TICK
Answer the prompts... NOPE - NO PROMPTS, HOWEVER, I GET THE THE LINE, DAT AND PNG FILE IN THE SUBFOLDER (SEE ATTACHMENTS)

Run with the Ruby Console open to see if there are any error-massages...

HERE'S WHAT I GET:

Error: #<NoMethodError: undefined method length' for nil:NilClass> C:/Users/nixch/AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Plugins/SKMtools/ImageTrimmer.rb:278:in make_edges'
C:/Users/nixch/AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Plugins/SKMtools/ImageTrimmer.rb:201:in process_image' C:/Users/nixch/AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Plugins/SKMtools/ImageTrimmer.rb:170:in initialize'
C:/Users/nixch/AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Plugins/SKMtools/ImageTrimmer.rb:834:in new' C:/Users/nixch/AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Plugins/SKMtools/ImageTrimmer.rb:834:in block in <top (required)>'

Java installed and enabled on your computer [the usual default]. - TICK
Also check that the .jar file-type is set to open with Java [execute] and NOT to open in your [de]compression application - some hijack various file extensions that are used by things like Java and stop them executing... - TICK
[/attachment]

The only slightly untoward event is that my virus protector is giving me a sequence of 3 warnings (I've attached 2). I hit the "Allow" every time (even when I've told it not to prompt me for 30 minutes it still pops up).

Windows 10, Sketchup Pro 2020
Have attempted on 2 other png images and same sequence.

Please help...

[attachment=4:9vweqji1]<!-- ia4 -->shrub_Elev_2[Edges].png
[attachment=3]shrub_Elev_2.png<!-- ia4 -->[/attachment:9vweqji1]