Ok. Then we have a possible problem on updates here.
Whenever the template file in the installation location
Code:
C:\Program Files (x86)\Calibre2\resources\jacket
is updated, the local override copy
Code:
C:\Users\<user>\AppData\Roaming\calibre\resources\jacket
obviously is not. And I do think that users should be made aware of this when template files are updated. Not everybody has the knowledge to know that when a feature is updated, accompanying template files might also be involved.
For instance, I just checked the master template against my local copy and even found a 2nd missing update, so I missed at least 2 updates already.
This might lead to unexpected behavior (and erroneous bug reports

)
Perhaps the change logs can include update info on template files?