in beta29 i have next glitch:

1) Select in explorer 2 or more C++ files.
2) Move its to EmEditor icon.
Result = collapse all text in EmEditor window.
If i opened C++ files with Emeditor “Open” dialog, or open these files without highlighting, there are no glitches.

P.S. (Last editing)
Sorry, there are temporary glitch.
I have it sometime with all C++ files.