Hi @Bukovnik,

To really get a solid answer, you will probably need to provide dummy copies of the workbooks being used and the macros. We don't need to see any of the actual data, but the file structure needs to stay the same. Also if the files (or worksheets) have a specific naming scheme then you can mock them up but keep the scheme the same. It shouldn't be as hard as you imagine, but we could keep guessing all day about where the problem lies but without testing solutions on Excel 2013 no one can confidently tell you why you are having this problem.

abousetta