ElectricFeet on "[Theme: Customizr] Image problems in 3.1.6"

OK, I've spent a lot of today doing an exhaustive (I hope) investigation into the image problems.

All plugins disabled. Customizr 3.1.6. Wordpress 3.8. Bitnami local installation.

Twentytwelve loaded:

• Select Media > Add new > add an image
• The image uploads and creates:
  • 150x150
  • 300x300
  • 624x624
  • Original - 1024x1024
• Media > Library: looks fine
• Edit page > Set as featured image: Works fine;
• Media > Library > Delete permanently: Deletes all sizes

Customizr activated; no retina support:

• Select Media > Add new > add an image
• The image uploads and creates:
  • 150x150
  • 270x250
  • 300x300
  • 1024x500
  • Original - 1024x1024
• Media > Library: Shows 1 pixel image BUG
• Edit page > Set as featured image: Image displays when media library shows, but featured image shows as 1px image; Customizr front page shows 1px image BUG
• Media > Library > Delete permanently: Deletes ONLY original. All other sizes are not deleted BUG I have to manually delete them all.
• Once featured image is deleted, Customizr front page picks up 5th (???) image on page, not the first image BUG (could be due to my bootstrap scaffolding?)

Customizr activated; with retina support:

• Select Media > Add new > add an image
• The image uploads and creates:
  • 150x150
  • 150x150@2x (really 300x300)
  • 270x250
  • 270x250@2x (really 540x500)
  • 300x300
  • 300x300@2x (really 600x600)
  • 1024x500
  • 1024x500@2x (really 1024x500) TINY BUG (already reported on the Customizr forum)
  • Original - 1024x1024
• Media > Library: Shows correctly (so retina support fixes the bug above)
• Edit page > Set as featured image: Works fine (so retina support fixes the corresponding bug above).
• Media > Library > Delete permanently: Deletes all image sizes (so retina support fixes the corresponding bug above)
• Once featured image is deleted, Customizr front page picks up 5th (???) image on page, not first BUG (again, bootstrap scaffolding?)

Switching themes 1: twentytwelve to Customizr

Twentytwelve activated:

• Select Media > Add new > add an image
• The image uploads and creates:
  • 150x150
  • 300x300
  • 624x624
  • Original - 1024x1024
• Media > Library: Looks fine
• Edit page > Set as featured image: Works fine;

THEN: ...Switch to Customizr

• Images are now incorrect sizes, of course (I guess there's no way for Customizr to know this, but it means that a plugin for regenerating images really is necessary if you switch themes a lot)
• Media > Library > Delete permanently: Customizr doesn't delete the 624x624 image. I consider this a BUG too. Not knowing what's happening under the covers, I suppose it's actually a bug in Wordpress, not Customizr, but I'm not sure.

Switching themes 2: Customizr to twentytwelve

Customizr activated; with retina support:

• Select Media > Add new > add an image
• The image uploads and creates:
  • 150x150
  • 150x150@2x
  • 270x250
  • 270x250@2x
  • 300x300
  • 300x300@2x
  • 1024x500
  • 1024x500@2x
  • Original - 1024x1024
• Media > Library: looks fine
• Edit page > Set as featured image: works fine;

THEN: ...Switch to twentytwelve

• Images are now incorrect sizes for twentytwelve, of course
• Media > Library > Delete permanently: twentytwelve doesn't delete the following images:
  • 150x150@2x
  • 270x250
  • 270x250@2x
  • 300x300@2x
  • 1024x500
  • 1024x500@2x

Again, I consider this to be probably a bug in Wordpress, not twentytwelve. The delet functionality in Wordpress should delete all sizes of an image, not just the theme currently loaded.

Switching themes 3: Customizr to twentytwelve

Customizr activated; without retina support:

• Add an image etc and get all the bugs above

THEN: ...Switch to twentytwelve

• Media > Library > Delete permanently: twentytwelve doesn't delete anything apart from the original BUG

Again, I consider this to be probably a bug in Wordpress, not twentytwelve. The delet functionality in Wordpress should delete all sizes of an image, not just the theme currently loaded.

Conclusions

1. If you're switching themes a lot (a) make sure you manually clear up after you've deleted images and (b) try an image regenerator when you switch back (@nikeo uses http://wordpress.org/plugins/regenerate-thumbnails/)
2. There are a few bugs in Customizr 3.1.6 images (which I'm sure @Nikeo will fix), but most of them are fixed if you select retina support (in Customiz'it > Images).
3. I need confirmation (from someone who knows how the media library works under the covers) that the deletion bug above is a Wordpress bug, not 2 bugs in both Customizr and twentytwleve.

Hope this helps a few bleeding-edge users fix their image problems and helps @nikeo fix them permanently.