I have a smallish (smaller than 100 rows, 20 columns) with a mix of data and formulas. There are no macros or graphics. When I tried to sort some data (data → sort), the “sort” menu item was greyed out.
program: calc
Version: 4.3.5.2.0+
Build ID: 4.3.5.2-10.fc21
uname -a gives me: Linux captain-ahab 3.17.8-300.fc21.x86_64 #1 SMP Thu Jan 8 23:32:49 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux