Need urgent help - Plotly Dash - Callback triggers sometimes & the same callback doesnt trigger sometimes

[Emil]

Your issue sounds a little like some of the problems that i have experienced with recent versions of Dash,

Callbacks not working correctly in dash > 1.6.1

A few people seems to be having issues with callbacks in the recent versions of dash (specifically, newer than 1.6.1), myself included. I have created a MWE that should demonstrate the issue, import dash import dash_core_components as dcc import dash_html_components as html from dash.dependencies import Input, Output, State # Data for selectors. regions = ["DK1", "DK2"] base_years = [2018, 2019] model_index = {region: base_years for region in regions} # Configuration keys. ctrl_ids = [0, 1, 2…

If this is indeed the case (and since i have not seen the code, i am just making a wild guess), the problem is with Dash, not your code. The good news is that the problem is fixed by the new wildcard callback logic. The bad news is that this code is not released yet, i.e. to get the update right now, you would need to build Dash from source.