The OpenCL profile method writes binary data into the xml file, which can make the file unreadable. Additionally, OpenGL writes a log file with the detailed device information. The same should be true for OpenCL.
Fixed with: https://cgit.freedesktop.org/libreoffice/core/commit/?id=334e2dc9c3da4519e31e0452a40d3a958c401876
Tomaž Vajngerl committed a patch related to this issue. It has been pushed to "libreoffice-5-1": http://cgit.freedesktop.org/libreoffice/core/commit/?id=8d3dd678bf9fd50a736cc0ff956f1efd7e660502&h=libreoffice-5-1 tdf#99453 opencl: better logging of devices and device selection It will be available in 5.1.4. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Sounds like its fixed then =)