I would have a look at your property file itself, not w/Library Manager, but an editor. Confirm that the property you're looking for is in Title Case. If you are familiar with reindexing your library, I would try that. If you are not familiar with reindexing, repost for more information.
I have a look into the property file on my HDD and there is only property Dodavatel .... with Upper case...
Don't know what to do with it. I don't mmind it at this moment but it is strange behaving.
probably that is not your issue, but there is another place where some properties are changed regardless of the setting in Centlib.prp: We suffered from
%SDD_HOME%\standard\map.cfg translating "TOLERANCE" \= "Tolerance"
starting in some release.
For a lot of designs we now have duplicate property names - and automation does not care about UC/LC!