Originally Posted by
Zim
I don't know everything about every build of ZC, and I too have had my share of mysterious data reversions from time to time...
So I don't know what your system is going through, but I can offer a probable solution:
Load the file from your old file from (C:\Program Files (x86)\ZC 2.10) into 2.5's ZQ, the quest editor, and see what it says from there.
Hopefully it'll act like 2.5's ZC is doing and read your most recently modified data. Then go ahead and resave using 2.5.
You should at some point get the message "this file was saved using an older version of ZC," and you'll have to rename the file using Save As, a regular f2 save or drop down menu to save will not work until you use a Save As.
That should bring your file up to date with 2.5 and 2.5 should at that point be able to read all the modified data. When it's read from your 2.1 folder, it's also using all the ".cfg"-esque files from 2.1, the .sav, etc. So reload it from 2.1's folder using 2.5's ZQ, resave the file into your 2.5 folder, and it will use all the 2.5 data from there.
Hope this helps you.