I am running a fresh install of 24.04 on VirtualBox 6.1.50_Ubuntu r161033 (with a Ubuntu 22.04 host). App Center opens to a white screen and immediately closes.
Below is a screenshot of the relevant portion of the syslog.

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4 Answers
Accordin to what i read and having recently issues running 24.04 on VM and disableing 3D accelereation i also tried that here...
So Settings > Apps > App Center > disable opengl.
For me it now opens.
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I had the same problem. For unrelated reasons, I changed the windowing system from Wayland to X11. Then, I launched snap-store from the terminal to see and error messages. Here is what I got:
~$ snap-store
Gtk-Message: 11:55:34.391: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.
(snap-store:8363): Gtk-WARNING **: 11:55:34.640: GTK+ module /snap/snap-store/1134/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 11:55:34.640: Failed to load module "canberra-gtk-module"
(snap-store:8363): Gtk-WARNING **: 11:55:34.650: GTK+ module /snap/snap-store/1134/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 11:55:34.650: Failed to load module "canberra-gtk-module"
flutter: INFO snap-store: Logging to /home/diomass/snap/snap-store/1134/.local/share/snap-store/snap-store.log
After that though, the App Center did launch and work.
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THIS WORKED FOR ME! THANK YOU!
According to what i read and having recently issues running 24.04 on VM and disabling 3D acceleration i also tried that here...
**So Settings > Apps > App Center > disable opengl **