How to fix nothing happens when queue prompt in ComfyUI?

Sometimes when you click the Queue Prompt, nothing happens and it seems the “Queue Prompt” is not working.

One of the reasons is that there is a "caching" of ComfyUI, it will NOT queue the prompt if nothing changed in the workflow from the previous “Queue Prompt”.

Please see if you could find the control_after_generate in the KSampler and change it to randomized (means it will use a random seed number each time it generates anything), see the doc here https://blenderneko.github.io/ComfyUI-docs/Core%20Nodes/Sampling/KSampler%20Advanced/#ksampler-advanced.

Or just change the prompt a bit.