Start with a new text document in LO4.3. Write a Math formula. Save the document. Open the document in an older LO version or in AOO. Notice, that the formula is not shown correctly. If you unzip the file and extract the preview picture of the formula, you can see that it is wrong. To see the content of the preview picture drag&drop it to a Draw document. When you double-click the formula you can see, that the formula itself is still there.
Not reproducible for me with master with build ID 304c7f7d3cbfb0a696de1fbaa169df109f55395e. @Regina: did you try with a recent build ? Best regards. JBF
It is OK now in Version: 4.3.0.0.alpha1+ Build ID: 0b03f7ed575838f90e6b1ebec3538a3a214f81fb TinderBox: Win-x86@39, Branch:master, Time: 2014-04-30_01:30:46