I posted this at the Veracrypt forum several days ago. No response whatsoever. The same pattern has persisted for the past 2 days. Only folders from the encrypted partition are affected. So, today, I reverted back to Veracrypt 1.21, thus eliminating the problem with the Veracrypt interface focus that I described earlier. Hopefully, this reversion will also address and solve the related taskbar button problem. Usually the frozen taskbar buttons happen after some random period of time. I will just have to wait and see whether it occurs or not. I'll report back. If someone could confirm that v1.21 is safe and secure to use, I would appreciate it.