build break in sources/core/sc/qa/unit/ucalc_formula.cxx(823) : error : Assertion

Hi,

i tried to build lo master last weekend (win 1064bit) but failed - yesterday i tried again,
i did a clean before, but got same error:

D:/sources/core/sc/qa/unit/ucalc_formula.cxx(823) : error : Assertion
Test name: Test::testFormulaHashAndTag
assertion failed
- Expression: false
- Unexpected vectorization state: expr: '=AVERAGE(X1:Y200)', using software interpreter: 1

Failures !!!
Run: 225 Failure total: 1 Failures: 1 Errors: 0
warn:tools.debug:5496:3948:tools/source/debug/debug.cxx:72: no DbgTestSolarMutex function set
warn:fwk:5496:3948:framework/source/services/desktop.cxx:1024: Desktop disposed before terminating 
it
warn:tools.debug:5496:3948:tools/source/debug/debug.cxx:72: no DbgTestSolarMutex function set
warn:svl.items:5496:3948:svl/source/items/style.cxx:51: SfxStyleSheetBase left 7; 
SfxStyleSheetBasePool left 2
warn:legacy.osl:5496:3948:unotools/source/config/configmgr.cxx:168: OSL_ASSERT: items_.empty()

Error: a unit test failed, please do one of:
make CppunitTest_sc_ucalc CPPUNITTRACE=TRUE # which is a shortcut for the following line
make CppunitTest_sc_ucalc CPPUNITTRACE="'C:/PROGRA~2/MICROS~2.0/VC//../Common7/IDE/devenv.exe' 
/debugexe" # for interactive debugging in Visual Studio
make CppunitTest_sc_ucalc CPPUNITTRACE="drmemory -free_max_frames 20" # for memory checking (install 
Dr.Memory first, and put it to your PATH)

D:/sources/core/solenv/gbuild/CppunitTest.mk:90: recipe for target 
'D:/sources/core/workdir/CppunitTest/sc_ucalc.test' failed
make[1]: *** [D:/sources/core/workdir/CppunitTest/sc_ucalc.test] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:247: recipe for target 'build' failed
make: *** [build] Error 2

any hints?

Regards
Oliver

build configuration is:

/cygdrive/d/sources/core/autogen.sh \
--with-build-version="$(date +"%Y-%m-%d %H:%M:%S %z (%a, %d %b %Y)")" \
--with-vendor="LO 5.X Debug Build" \
--with-external-tar=/cygdrive/d/sources/lo-externalsrc \
--with-junit=/cygdrive/d/sources/junit-4.10.jar \
--with-ant-home=/cygdrive/d/sources/apache-ant-1.9.5 \
--disable-ccache \
--enable-pch \
--without-fonts \
--with-lang="de" \
--with-package-format="installed msi" \
--enable-dbgutil \
--enable-debug \
--enable-crashdump \
--disable-online-update \
--with-help \
--with-myspell-dicts \
--enable-ext-wiki-publisher \
--enable-ext-nlpsolver