I have a strange phenomenon on TB 68 which has just been installed. After a fraction of a second, the folder panel disappears. When I deactivate all add-ons, this no longer occurs. When I activate Cardbook alone, this happens.
Note, when another tab than the one with the folder tree is in the foreground, there is no problem either.
At your disposal for further investigations.
Thank you in advance for your help, because I cannot do without Carbook 🙂 .