Disabling Render Plugins
Disabling the Cycles add-on while it is active in the viewport can cause Foam to hard crash Blender. If you need to do this it's best to restart Blender after disabling the Cycles add-on. For 4.0 and later disabling Hydra while it is in use can also cause problems.
Right-Click Context Menu (Blender 3.6.0-4.0.1)
On string fields that allow searching, right clicking can hard crash Blender 3.6.0 to 4.0.1. This is because of an internal Blender issue that will hopefully be fixed in an upcoming release: #115437
Quad View
Blender 3D Views can be divided into four regions with three of them locked to orthographic views. Popup foams work in each of these as if they were separate areas. However Persistent foams are disabled for now until quad view is closed. Persistent foams will work in separate 3D Views however.
Upgrading
Because we store the enabled/disabled state of foams in Blender preferences, disabling and re-enabling Foam in order to upgrade it can reset all of your foams to be enabled. This can cause unexpected behaviour if several foams have the same activation key.