Something that kept bugging me that I have only just worked out.
When I have a videos tagged with a "Media sub-type" - this data kept disappearing on some files for no apparent reason.
Seems that this happens only on files that do NOT also have a "File format" tag. Once they are also tagged as HD, standard def, DVD etc - they never lose any Media sub-type info.
Does this happen to anyone else? If someone can verify I'll raise it as a bug.
Note: this is in 0710, don't have 0810 installed to test so if this is already fixed...