Can't edit moved chart
 

Moved a trendline from one file into my master file. Broke the links and have
data within the master file as well. Yesterday I edited the data series
ranges, changed axis and moved labels without any problems.

Today when I opened the file I can't edit the data series ranges, change
axis or even move labels. Any ideas?

The original trendlines were in 2007 (xlsx). They are now in xls (2003 I
think). But they worked yesterday. Thanks