1. Config\Display\"Show parent dir also in root of drive": checked.
2. Have both TC panels show C:\
3. create a directory called "Temp1"
4. In left panel, cd to "Temp1"
5. In there, create a directory called "Program Files" or something else that exists in C:\
6. Activate cm_SyncChangeDir command
7. In left panel, cd to "Program Files"
8. In left panel, cd to ".."
9. In left panel, cd to ".." again.
see what happens?

It's funny indeed but not too serious. Hope Christian has the time to correct it before releasing 6.50.
And, BTW, don't you thing we have too many "Announcement" and "Sticky" posts in the beginning of this forum? They are indeed useful but aren't they too many?
Have fun...