Kdenlive/Manual/Effects/Custom
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Effects - Custom
The Custom Group in the Effect List is where effects appear when you choose
from an effect in the Effect Stack.Defect in ver 0.9.2
There was a defect in ver 0.9.2 of Kdenlive where saving a new effect made the existing custom effect invisible in the Custom section. The upshot was that you could only have one custom effect visible. This is fixed in version 0.9.3. See See this Bug Tracker Entry.
The workaround in ver 0.9.2 was - Start and Stop Kdenlive. Restarting Kdenlive causes the
to be updated and you can see all the ones you have saved.(fixed)