OSX on external drive - MAS apps damaged when changing computer

hi,
i have my osx mountain lion installation on an external harddrive (ssd, thunderbolt connection)
and i'm doing it for a long time without problems. everyday i change the computer 2 or more times.
home -> office -> home ....
since a couple of days a lot of apps puchased in mac app store dont start anymore. the icon
bumps just once, the login window "you didnt buy this app on this computer ...." pops up. this is
ok, i login and then - some seconds later an error popup pops up.
e.g.
“Renamer.app” is damaged and can’t be opened. Delete “Renamer.app” and download it again from the App Store.
app deleting and downloading/installing agian works. until i connect on the next computer. then
the **** starts again.
this unusual work process worked all the time, so i dont know waht to do. downloading and installing
apps all the time, twice a day cant be a solution.

i just startet a test.
1. clean mountain lion install on a new external usb hard drive
2. after all the only thing i did was to login into mac app store and reload 2 of my purchased apps
3. apps work
4. shutdown and start the hd on another mac
5. apps dont work with the described error
6. shut down and start again on the first mac
7. apps work
the problem was suddenly there, no updates or upgrades in the last time. the apps worked
after upgrading to 10.8.2. and suddenly nothing works anymore. in my opinion this must
be a mac app store bug. it would be very strange if so many apps from one day to another -
without updates - dont work anymore.

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