Unusual failure on libreoffice-5-0 branch

Hi all, 

Getting an odd failure on a backported patch on Jenkins:

https://gerrit.libreoffice.org/#/c/22947/

Only failing on Windows, error is:

[build ALL] top level modules: build-non-l10n-only build-l10n-only
C:/cygwin/home/tdf/lode/jenkins/workspace/lo_gerrit_master/Gerrit/Gerrit/Platform/Windows/sc/qa/unit/copy_paste_test.cxx:57:ScCopyPasteTest::testCopyPasteXLS
assertion failed
- Expression: xDocSh.Is()
- Failed to load chartx.xls.

C:/cygwin/home/tdf/lode/jenkins/workspace/lo_gerrit_master/Gerrit/Gerrit/Platform/Windows/sc/qa/unit/copy_paste_test.cxx(57)
 : error : Assertion
Test name: ScCopyPasteTest::testCopyPasteXLS
assertion failed
- Expression: xDocSh.Is()
- Failed to load chartx.xls.

Failures !!!
Run: 1   Failure total: 1   Failures: 1   Errors: 0

Error: a unit test failed, please do one of:

export CPPUNITTRACE=""[full path to devenv.exe]" /debugexe" # for interactive debugging in Visual 
Studio
export CPPUNITTRACE="drmemory -free_max_frames 20"            # for memory checking (install 
Dr.Memory first, and put it to your PATH)

and retry using: make CppunitTest_sc_copypaste


Anyone have any ideas?

Chris