I had this problem too ; try to uncheck all the cases in the dialog box then check one by one the ones you need . I have affected the double-click on a mouse button , sometimes a "classic" double click don't work but my mouse-button double-click does work .
Export as morph target , that means that the pose and scalling settings of your figure will not be exported , so if you didn't change OR you don't need the pose , you can leave it unchecked , the result is the same .
You MUST leave it unchecked if you need to export a posed figure or if you need some scale settings - and the Morphforms dials for V4 act like scale changes too .
If you work with a zeroed figure , even if you use some dials (except Morphforms) , checked or not it's the same thing .
You can still use the exported file if you want to import it into a 3d modeller to make a custom morph , then apply it in Poser , it's not a problem .

( I've experienced this with Zbrush)

I have never made morphs for v3 . I 've started directly with V4 and I didn't understood right from the start why I couldn't get the morphs I wanted . I was looking on the marketplace for a character with THAT middle-line , I was ready to purchase it . But nothing came in ... Recently I had V4 and V3 in the same scene and I've changed the preview mode from texture smoothed to polygons , then I understood . People  who - like me- never used V3 to make morphs can't see the difference ,V4 is such a nice evolution . I guess merchants don't criticize her - openly - but I'm not merchant , I would be glad to make morphs and share them for free .
In the meantime we can only use displacement maps , but we must let know Daz that there are some end users that are not satisfied with that low-poly policy - at least for the face -, so they don't do this again for the next generation .

There is an -utopic? -solution , maybe someone has already done it ? taking V3's head and joint it to v4's body . I saw some threads on putting one character's head on another . The dream would be to use V3's head morphs and v4's bodymorphs and textures ...

Or - maybe - subdivide the head , create a new V4 obj file , and do the same for all needed head morphs :
a head morph dialed on 1 - export - subdivide at the same level-  import as a morph target for the new head and so on ...
Personal use only and not compatible with character packs -unlesss doing the same for a custom head morph ! , but easily compatible with textures .

I guess we'll have to wait for V5 ...

Oh estherau , that's my problem ! I've tried to make that middle line and it's impossible , unless using displacement maps , but this is tricking and use much more ressource . I'm not that free in making custom morphs in Zbrush ; with so little polys I get stretched textures .
V4 is very versatile but I feel very frustrating to have a particular idea and not being able to concretize .I saw lots of different faces of V4 , some very original - not "V4 alike " , yes she's very versatile - but I still can't make that middle line on the low lip and I haven't seen it on a V4 morph neither . It's a very natural feature , you can see it on lots of human lips , and I find it very cute and attractive .
So I'll change my mind the day when someone will be able to morph that middle line .

Have you noticed , the V4 lips are so "low-poly" , comparing to V3's lips , it's so hard to make what I want with such little number of vertices - for a custom morph .I don't understand why Daz made her face with such economy of polygons , our computers evolved and they can manage higher amount of polygons .Really , I'm very disappointed

And what if you put a zero angle instead of 45 ?

Have you tried to put the readscript  mytoon on the top like this :

readScript ":Runtime:libraries:Pose:Julla:MYTOON.pz2
readScript ":Runtime:libraries:Character:DAZ People:Victoria 4.2.cr2" 
readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:InjDeltas.V4Morphs++All.pz2" 
readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:InjDeltas.MuscleAll.pz2" 

It seems that Poser reads the file from the end to beginning so the morphs++ must be read before the dialed character

It looks that's what I was looking for , I'll give a closer look this evening and I'll let you know !
Thank you so much !

It makes sense , the rigging . This is why XD create a new obj .
I'll search for it otherwise I'll open a new thread .
Thank you !

We are all demanding for a "more opened" system for Vue's plants !
TY !

I think I saw it in a commercial poses package for V4 I can't remember which one .
In case you don't find it , try to fit it as thefixer says , but start with the Aiko's fit , it should be easier than V3's fit .

Quote -
Now if e-frontier (or whoever owns it now) would allow Amapi 
to go open-source, I'd be really happy.   
I'd love to rejigger a few things in the source
to make Amapi perfectly Poser-friendly.

I don't belive that Amapi would ever be open source -it's still a commercial software and the free 6th version has very advanced tools .By the way , I saw that it's no longer available for download at http://forums.polyloop.net ; fortunately I've grabbed it before !
I would like just to encourage you to find a legal way for doing this , because Amapi is such a great software !

You can find the V4 definition file here :
http://posable.avatiser.com/en/1006/

To make it work with V4.1 just open the file with a text editor and change " blMilWom_v4.obj " into " blMilWom_v4b.obj " to have the correct obj file name .

It works fine for custom morphs - do not check  "auto channel assign' !
It didn't work for dialed morphs - but it's no so difficult to add them by editing the inj file .

Attached Link: http://www-cache.daz3d.com/store/item_file/3205/image_medium.jpg