Hi there.

Did some digging, reading ~/.xsession-errors

Over 100 of these:
[  9726.81 ] error    3 BadWindow    request   15 minor    0 serial 
9621614: "BadWindow (invalid Window parameter)"
Maybe 50 of these:

[2019/07/16 05:38:09.940] X Error: BadWindow (invalid Window parameter) 3
   Major opcode:  12
   Minor opcode:  0
   Resource id:  0x2e00003

On 16/07/2019 08:06, Philip Ashmore wrote:
> Programs that sometimes fail to restore across boots:
+Amarok
+Evince starts but doesn't remember previously open files.

Regards,
Philip Ashmore