Thanks, Bart - even negative data points can be helpful!
There's definitely something odd going on - there's no obvious correlation between the original values and the final adjusted values, though the adjusted values appear to be consistent for repeated applications to the same file(s), e.g. for two files with identical settings other than WB:
Copied from primary variant (WB/Tint): 4836/4.2
File 1: Original 5047/0.7
After pasting adjustments: 5069/0.7
File 2: Original 5138/4.0
After pasting adjustments: 5008/0.5
What is interesting is that the 'adjusted' values appear to be file-dependent, rather than related to the original values; thus, if I manually change the original settings for File 2 to 5047/0.7 (as per the original values for File 1), then paste the adjustment as before, the 'adjusted' values for File 2 are still 5008/0.5.
I've now managed to tie this down a little further, and it appears to be related to whether the file has an LCC profile applied. If I reset the file so as to delete the LCC, the WB & Tint values paste correctly; undoing the paste, reapplying the LCC and then redoing the paste results in the identical incorrect values as previously. In one instance the incorrectly pasted values were identical to those of the associated LCC, but that does not appear to be consistently the case.
Further investigation is clearly needed, but the fact that that it works correctly every time in v7.2.4 on the same machine strongly suggests a bug in v8.2 rather than an installation problem. I'll check further on my Win 8 laptop as a second reference - a very quick test on that machine indicated similar anomalies when attempting to paste WB settings directly to a reference LCC file itself, but I need to look into that further with standard files.
Cheers,
Malcolm