The customer created a new Global Collection and defined some search criteria for it.
He noticed that only models from the MLS are collected in the Global Collection.
When doing the search (the Global Collection is based on) manually, using the normal search feature all expected models are listed.
After restarting all SpectroServers for a software upgrade the Global Collection is populated correctly.
The customer created a new Global Collection, based on the same search criteria...and the content is again incomplete.