Ah Citrix.
And Flash.
And a locked down user environment that prevents Active-X installs.
It all adds up to a recipe for entertainment when upgrading Flash ( in this case Flash 9 to 10) on Citrix 4.5.
As it turns out, an upgrade as administrator was enough for things to kick on happily enough for admin users, but not clients. Post 'upgrade' clients effectively had no flash at all - a nice backwards step.
The trick with this one was registry permissions - administrators had them on the updated registry keys, but everyone else missed out. I tracked down some assistance at: http://www.brianmadden.com/forums/t/32557.aspx .
Admittedly I skipped most of the instructions - the critical ones (for me) were the registry permissions - namely:
1. Find the key HKCR\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000} (on 64-bit Windows this one is located under HKCR\Wow6432Node\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000}) and grant READ permissions (include child keys) to the appropriate groups (usually everyone).
2. Rinse and repeat the permissions change for HKCR\CLSID\{D27CDB70-AE6D-11cf-96B8-444553540000} .
This was pretty much a instant fix, restart IE as a user and everything was happy once more.
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