Sorry friends!
It seems my problem was between the chair and the keyboard.
I searched the root directory of my DCS and found several files from an old SU-30sm installation that I had tried to make work.
I deleted all SU-30sm files that were in the DCS root directory.
I left the SU-30sm installed only at: C: \ Users \ username \ Saved Games \ DCS.openbeta \ Mods \ Aircraft \ Su-30sm
After that my DCS did not work,
So I ran the DCS restore, and that made it work again.
After all this, the SU-30sm also worked normally, everything working including the F2 view.
It seems that those old SU-30 file fragments, which were scattered through the root directory of DCS, were conflicting with the new files of this current SU-30sm.
Many thanks for your interest,
Sorry for bad English.