Cannot start YAP anymore on Windows 10 - "MiKTeX encountered an internal error."

Since six weeks or two months YAP does not work for me anymore.

May be, Windows 10’s update 1607 was performed then. But I’m not sure.

Message in “MiKTeX Problem Report” is “MiKTeX encountered an internal error.”, Data-field is empty. Complete report below.
This error occurs in both cases: when started from command line WITH and WITHOUT a -DVI-filename. It occurs as well, if started from “Start”.
MiKTeX-update was frequently done.

Any idea? I would appreciate it very much! I have to run dvipdfm now, to check my changes. That’s VERY timeconsuming due to the 10,000 graphics included.

Many thanks in advance!

Regard
Radler

MiKTeX Problem Report
Message: MiKTeX encountered an internal error.
Data: 
Source: LibrariesMiKTeXCoreSessionmfmodes.cpp
Line: 50
MiKTeX: 2.9
OS: Windows 10 Pro, 64-bit, build 14393
Invokers: cmd
SystemAdmin: no
PowerUser: no
Root0: C:UsersFranzAppDataRoamingMiKTeX2.9
Root1: C:UsersFranzAppDataLocalMiKTeX2.9
Root2: C:ProgramDataMiKTeX2.9
Root3: C:Program FilesMiKTeX 2.9
UserInstall: C:UsersFranzAppDataRoamingMiKTeX2.9
UserConfig: C:UsersFranzAppDataRoamingMiKTeX2.9
UserData: C:UsersFranzAppDataLocalMiKTeX2.9
CommonInstall: C:Program FilesMiKTeX 2.9
CommonConfig: C:ProgramDataMiKTeX2.9
CommonData: C:ProgramDataMiKTeX2.9