PyPlot does not display x and y coordinates

Currently I have three issues with PyPlot:

1. it does not show the cursor position. In the upper right corner it just says x= and y= but no numbers
2. if I zoom in the ticks and numbers on the axes disappear (I mean, the original ticks and number stay, but if I zoom in such to an area where there were no ticks and numbers in the first place no new ticks and numbers appear; this is different compared to Matplotlib in Python
3. error messages on the console like:

`XmbTextListToTextProperty result code -2`

Any idea?

Ubuntu Linux 18.04, Julia 1.7.3, output of st:
```
(KiteControllers) pkg> st
Project KiteControllers v0.1.1
Status `~/repos/KiteControllers/Project.toml`
[90980105] KiteUtils v0.4.7
[2774e3e8] NLsolve v4.5.1
[d96e819e] Parameters v0.12.3
[d330b81b] PyPlot v2.10.0
[90137ffa] StaticArrays v1.4.5
[1e6cf692] TestEnv v1.7.3
[21f18d07] Timers v0.1.5
[7dcfa46b] WinchModels v0.1.1
[de0858da] Printf
```
I tested on a second laptop with Ubuntu 20.04 with the same result.