Addon Button will appear after several minutes

Setup, Configuration and Use Beginners
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1

Hello everybody,

the Menu Button Addon is not present at the start of the paper UI. (see screenshot)
Only when I reload the page a few times do I get the menu item.
For every update, the error 404 - Not found in the lower right corner comes
Can someone help me please?
Addon_Button_nicht_da

many Greetings,
mark

2

System setup?

3

Windows 10 64 bit

4

Openhab version, Java version, please
Browser used

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6

Have you updated to 2.4 yet?