Describe the bug
The usual way to select (or change) a symbol or picture via the VIS edit button no longer works, this one:

Nothing happens, no entries in the logfile.

VIS is up and running:

Expected behavior
The button for selecting or updating symbols or pictures should show the libs as usual.

Screenshots & Logfiles
The lib with the symbols is present, the links work in the views:

But these links do not work at all:

Versions:

• Adapter version: v1.5.6
• JS-Controller version: 5.0.19
• Node version: 18.16.1
• Operating system:

Running in a VM under Proxmox.

Additional context
Worked until yesterday.

What can I do to make this work again?