FJ Software

@Azol: Did you try the workaround from my first post ?

Yes, but it didn't help. I already stated it in my 1st post in this thread.

@J1PEccp: Thunderbird Lightning has its own Timezone settings for each calendar. Don't blame on MyPhoneExplorer when you are not able to set up your system ...

Were you able to reproduce this erratic behavior?

I re-checked the timezone setting and I have the same timezone set both on the phone and on my computer.

You can use CamStudio (camstudio.org) to record all screen activities during install process. It's free and simple to use.

If I venture to sync them - then they are displayed wrong.

There were several appointments (all day, recurring) that were created on the phone, but after syncing they got shifted for +1 hour in Thunderbird, i.e. from 01:00 till 01:00 of the next day.
I have manually recreated these in ...

I experience exactly the same problem but syncing to Thunderbird with Lightning Calendar Add-on.

Just in case, I tried the option you recommended but it didn't change anything for me.