Works fine here in full merged mode.
Be sure it's not locked by another application and be sure your reported chd is ok (chdman -verify).

From 3.118b to 3.119 nothing really changed for the chd routines (metadata check ok..but that doesn't play a role here). If you still get the problem after a rescan with no other interfearing tasks/correctness of the chd in question, send me your cmpro.ini, the belonging settings file *.cmp and let me know which MAME version you used for importing the data.


Roman Scherzer