Hmm, looks like it just sent an email that pretty much confirms this. 

Can I ask, what caused this to pop up in 2.1 but not 2.0?

I'd be a lot less freaked if there was a description rather than a load of 
numbers.
Particularly as the numbers don't immediately related to the proj parameters 
for the projection I usually use (which because they're pair with a description 
I've started to become familiar with).

It also seems indiscriminate about what layers it's picking on. Mostly my 
projects are displayed in MGA94 zone 51 with OTF on. If I remotely understand 
this dialogue it's asking to transform a layer in AMG84 zone 51 into WGS84. Why 
only this layer? There are other layers in this project that aren't either 
WGS84 (which I presume is being used as a staging datum before moving to MGA) 
and they don't get picked up?

> On 21 Jan 2014, at 1:35, "Anita Graser" <anitagra...@gmx.at> wrote:
> 
> Hi,
> 
> I suggest to deactivate the Select datum transformations dialog by default.
> 
> Here is why:
> - Most users are happy with the default transformations. (I assume that's the 
> case because it's not often a topic in the support channels.)
> - It adds at least two more clicks for opening a layer (if it has to be 
> transformed).
> - Opening old project files is a real pain (until you notice and decide to 
> use "remember selection").
> - Many users have no idea what to do with the dialog. It's just a list of 
> weird parameters which most have never seen before. You only get some 
> information about "preferred" and "deprecated" transformations on mouse-over.

I hadn't even noticed that until you mentioned it. I'd be really tempted to 
swap them around. Most of the hover text in the dialogue. Details in the hover 
over. 

> - Hiding deprecated transformations does not seem to work currently (tested 
> with nightly on Windows 7).

+1

> - Users who need non-standard transformations could add them to their QGIS 
> options.
> - I think we would just scare away users if the first thing they see when 
> they try to load some dataset is this dialog.

Not here, just confuse them by having a project they made 2 months ago fail in 
interesting ways. 

> Best wishes,
> Anita


-ramon.
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