I've tested this problem in both the stable version of LO (3.3.2) as well as the most recent stable PortableApps version (3.3.2). This bug is only happening in the PortableApps version.
The problem is this: LO Portable crashes when printing a Writer document with merged data to a .pdf file. The document just freezes up, for several minutes, and I have to manually close the program and use document recovery to get it back. I've looked here in the forums and haven't come across the problem. Is this a known bug? Please let me know if I need to file something beyond this point.