Sudden compilation-preventing font issue

[Johannes Graumann <johannes_graumann@web.de>]

I can't figure this out ... happily working on my project and all of a
sudden I get this error upon texexecing:

bodyfont        : 12pt rm is loaded
kpathsea: Running mktextfm ec-lmr12
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode;
input ec-lmr12
This is METAFONT, Version 2.71828 (Web2C 7.5.4)

kpathsea: Running mktexmf ec-lmr12
! I can't find file `ec-lmr12'.
<*> ...ljfour; mag:=1; nonstopmode; input ec-lmr12

Please type another input file name
! Emergency stop.
<*> ...ljfour; mag:=1; nonstopmode; input ec-lmr12

Transcript written on mfput.log.
grep: ec-lmr12.log: No such file or directory
mktextfm: `mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input
ec-lmr12' failed to make ec-lmr12.tfm.
kpathsea: Appending font creation commands to missfont.log.
! Font \*12ptrmtf*=ec-lmr12 not loadable: Metric (TFM) file not found.
<to be read again>
                   \relax
\xxdododefinefont ...tspec {#4}\newfontidentifier
                                                  \let
\localrelativefontsiz...

\fontstrategy ...ame #1\csname #2#3#4#5\endcsname
                                                  \tryingfontfalse \fi
<inserted text> ...yle \fontalternative \fontsize
                                                  \fi \iftryingfont
\fontstr...

\synchronizefont ...strategy \the \fontstrategies
                                                  \relax \fi
\ifskipfontchar...
<argument> \getvalue {\@style@ \fontstyle }
                                           \edef \fontstyle
{\fontstyle }\if...
...
l.1
    % interface=en output=pdftex

Does anybody have any clue as to what what I screwed up here?

Thanks, Joh