InitError after update

After updating I get this:

import DataFrames, Dates, TimeSeries, Plots, MathOptInterface

ERROR: InitError: could not load library ".julia\artifacts\c34a53538bc6c87c8b376c3f6d0d3248830003bc\bin\Qt5Concurrent.dll"
The specified procedure could not be found. 

I guess this is from Plots.

My rule of thumb: ] build Plots solves a lot of problems.

It did not. If I run the script a second time it works. However, the error persists if I close Julia and open it again.

I suggest to create a MWE and open an issue in the offending package.