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We have made progress with the caching capabilities but this feature is still under final development. While caching will improve a number of usability aspects for large system navigation and discovery, it is not likely to address the problems you are describing with the variation in system object visibility.
There appears to be a problem with system discovery, although the variable results you mention are unusual. The deletion and recreation of the trusted application should not alter system object visibility because it should affect only the ability for Archive To Go to login to accounts in Enterprise mode. However, if you mean by “delete and regenerate the trusted app key” that you are recreating a new system definition, then it is the system discovery process which is failing to traverse your full GroupWise system.
We are finalizing a test application which may help identify where the process is failing within the system discovery and will let you know when it is available.