Can you elaborate? In which way is it non-stable? Which web browser and version are you using? screenshots would help please

The issues are with all browsers Firefox, Chrome and Microsoft Edge, latest version for all these.
Screenshots shows not the problems. Please see the video.

It looks as though the 'mouseover'/'hover' effect is being triggered outside the left icon bar - is that the problem you are seeing?

Is there any chance I can get login details for your site (on the private site details tab below) so I can see what specifically is causing the issue on your site?

A final question - what resolution are you running at? I'm wondering if its a screen size based problem?

It is not only the hover effect. It is also that the links don´t open from the leftbar. If I open the menu post with right mouse click and open it in a new tab it works. The links in the menu for components are also OK.
Can I hide the leftbar or where can I find the code for the leftbar?
I have also tested other sites and with iPad but the leftbar menu posts do not open.
The Version 3.4.57 works fine!

Is there any chance I can get login details for your site (on the private site details tab below) so I can see what specifically is causing the issue on your site?

This would help me isolate if the problem is specific to your site's settings or template

A final question - what resolution are you running at? I'm wondering if its a screen size based problem?

This will let me know if the issue occurs at a specific screen resolution

Can I hide the leftbar or where can I find the code for the leftbar?

You could hide it with CSS but it would make backend navigation almost impossible in JEvents

I have also tested other sites and with iPad but the leftbar menu posts do not open.

Are you using a touch screen laptop??

Any additional information about your setup that could explain why you are having these problems would be a great help

I have tested the site with an old laptop without a touch screen but with latest softwares and it works!
My problems must be the configuration of the laptop. I use a laptop with a touch screen but use mouse to navigate.
I want to thank you and I mean that my problem is solved!

I have now disabled the touch screen on my laptop and everything works fine with leftbar in backend but with iPad it is still not OK.
I wish a solution for that in next update.
Thank you once again.

Hello,

I am just checking if this is now resolved?

Many thanks
Tony

It is solved after a couple of updates of JEvents. My problems are solved
Thank you!