Just an update. Thanks everyone above for trying to help me. After going round in circles on the web trying to find Adobe FrameMaker support (no reply from tcssup@adobe.com), I eventually found the support I needed at techcomm@adobe.com. I got an instant response from Shivang and he guided me through various tests. Eventually he tested the 'bad' file himself and found it OK so I concluded that there was something wrong with my PC. Reluctantly I re-installed Windows 10 and then FM2019 and everything else. FM then read the files OK but refused to produce a pdf. I could not get the Adobe pdf printer to install. Again Shivang was very helpful and yesterday, a colleague of his did a remote logon to my PC and solved the problem, albeit after an hour or so of furious typing and head scratching. I think the problem was another pdf printer instance (from ABBYY FineReader) which was interfering with Adobe's efforts to install, a problem somewhat reminiscent of years ago when installing FrameMaker with other pdf generators including Adobe's very own Acrobat. So it is all working well now. FM is a great program and Adobe Support has been really excellent (when I found it), the best I've had from a large software company. Of course, we'd all like better diagnostics when things go wrong. Such is life.
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