The problem was in the conversion of pobj_t to the new flattened structure for PDD17. I've reverted that part of r25266 for now (in r26254). The problem is probably an incomplete conversion, with some parts of the code still expecting the multi-level structure. I'll work on a more complete conversion when I get back to the Windows laptop Friday night.
In the mean time, please carry on with language testing on Windows. Allison