I'm on 1.23wmf10 and the master build of both VisualEditor and Parsoid. I can insert and resize an image just fine, but clicking on the icon in the upper right performs no action. I discovered the following message:
Uncaught TypeError: undefined is not a function
load.php?debug=false&lang=en&modules=ext.visualEditor.core%2Cdata%2Cicons-vector%2Cmwcore%2Cmwgalle…:344
VeUiMediaSizeWidget load.php?debug=false&lang=en&modules=ext.visualEditor.core%2Cdata%2Cicons-vector%2Cmwcore%2Cmwgalle…:344
ve.ui.MWMediaEditDialog.initialize load.php?debug=false&lang=en&modules=ext.visualEditor.core%2Cdata%2Cicons-vector%2Cmwcore%2Cmwgalle…:528
oo.EventEmitter.emit load.php?debug=false&lang=en&modules=ext.visualEditor.base%2Cmediawiki%2CviewPageTarget%7Cjquery.pl…:112
(anonymous function) load.php?debug=false&lang=en&modules=ext.visualEditor.base%2Cmediawiki%2CviewPageTarget%7Cjquery.pl…:125
pollExternalStylesheets load.php?debug=false&lang=en&modules=ext.visualEditor.base%2Cmediawiki%2CviewPageTarget%7Cjquery.pl…:124
Version: unspecified
Severity: normal