When pushing a recent update to the Weever Apps plugin, the version number did not seem to be updating. Most documentation mentions updating the readme.txt file, but not the main plugin file version number also. Without updating both the new version will appear in the dropdown and as ‘development version,’ but not as the main downloadable file.
Moral of the story, update both or risk losing some hair!
More detail here. If you still have issues you should be able to e-mail plugins@wordpress.org for assistance (though certainly try the forums first).