Hi Stefan,
I was reporting this error before but could not reliably reproduce. Now i built Truck version from server and find the thing. While T-Merge resides on Main monitor all work well,as soon as it goes to upper monitor Context menu wont auto-select block under mouse.
In CBaseView line #2623 states:
if ((point.x >= 0) && (point.y >= 0))
This check _Absolute_ (monitor) coordinates, but those may be happily negative while correct. Either
* remove the test
* use ScreenToClient before check
* use other check
Oto