Ok, I observed this happening at least once, but can no longer reproduce it using either "Block Party", nor the custom comp and ecw ui samples, from the AE SDK. Specifically: I'm seeing successful custom UI drawing from Block Party, CCU and Custom_ECW_UI plugins, in PPro beta 26.1.0x6.
Gabriele, feel free to send me any/all info you find, which may help improve the repro.
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