Description:
Shotcut don't let me configure the effects that I'm applying to anything, because the configuration of it doesn't even appear. Last week it was working just fine, and the .appimage I downloaded from the official website works. I'm leaving two screenshots, one with the package from arch linux's "community" official repository, and another with the appimage, and I'm also supplying a log file with a complete terminal output.

Additional info:
* package version(s)
shotcut 21.03.21-1
mlt 6.26.1-1
qt5-base 5.15.2+kde+r180-1
ffmpeg 2:4.3.2-6

* config and/or log files etc.
are attached with this bug report

Steps to reproduce:
Open shotcut, create a new project, insert a video track, drag and drop any video/audio file, select it and then go to effects tab, click on "+", apply any effect (I tested with "Audio Spectrum Visualization") and try to see if you can edit the properties of the selected effect.