I had this problem some time ago and I mentioned it already in the old forum. If I want open some files over the context menu of the Windows explorer, EE ignores the first file and loads only the remain files. After reinstalling EE it works properly for a certain time - then it fails again.
I made also some tests:
- If I write the start command (same as in windows registry) directly in the command line and open the files with it, all works perfect.
- If the EE window is already opened, there is also no problem.
The problem appears only in Windows 10. On Windows 7 I haven't it.
Note also: It only happens for open the files in EE. Other programs/editors work well.
Hope this can resolved.