hi,
i'm facing weird issue:
once plugged my iPad to calibre the 'iOS reader application' plugin is disappearing.
If i'm restarting calibre w/o iPad plugged in - the plugin remains installed
all pre-requirements for the installation are completed (as described in this thread)
Win7 Ent, iPad 4 mini iOS 10.2, Calibre 2.73 x64, Marvin 2.9.1