Steps to reproduce:

• Have DF Taskbar set to vertical orientation
• Align Start button at bottom
• In Start10 use either the "Modern Style" or "Windows 7 Style"

The resulting Start menu does not display in the correct position, but is shifted off screen. I cannot test this with the Windows Taskbar of course because there is no option to move the Start Button on the Windows Taskbar.

I believe this may have been the issue with this Discussions post from 2017.

Sure, attached.

Here's a screenshot. The placement of the Start Menu is not consistent. Sometimes the menu appears way below the screen as is the case in the screenshot. Other times the menu hovers well above the lower left corner.

I have a dock I connect with at work. I most often have two external monitors connected to the laptop. I'll try to get another log generated tomorrow at the office.

Attached is the log generated with the two external monitors connected.

You probably already know this... I hadn't played with the Scaling for a while but I just did and it is a factor.
Things to add:

At 100% scaling

• Clicking the start button shows the start menu off screen, and often causes the DF taskbar to reload.
• Pressing the windows key shows the start menu in the correct
position

At 150% scaling

• Clicking the start button shows the start menu off screen, and perhaps less often causes the DF taskbar to reload.
• Pressing the windows key does NOT show the start menu in the correct position... it is offset.