EVENT:Timer works sometimes, other times not

Hi,
Initialising with WINDOW{PROP:Timer} = TimerValue, always non-zero.
EVENT:Timer places in ACCEPT loop after CASE EVENT.
Works in some Windows, others simply ignored.
Is there a prerequisite required?

Totally mystified.

One simple prerequisite to check, is that the window is open at the time you assign the timer.
There could also be something changing that timer value elsewhere.

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Thanks!
The simplest solutions are sometimes the hardest to see!