Thinking that it might have something to do with the version of gaussview being too old, I tried gaussview 5.x, which throws the same error. Gaussview (4.x), by the way, runs fine in wine 1.7.

Turns out it's a poorly written piece of software -- gaussview can't properly parse output generated by gaussian. Great...neither piece of software is cheap.

**Better yet, gabedit does not have any issue reading the unmodified fchk file.**

If you do need to use gview though,

**the solution is outlined here**: http://www.ccl.net/cgi-bin/ccl/message-new?2012+07+18+005

Briefly, edit your fchk file and change the "Number of basis functions" to the same number as is shown for the "Number of independent functions" i.e. change

to1 alpha 2 FOpt RB3PW91 Gen 3 Number of atoms I 101 4 Info1-9 I N= 9 5 89 86 0 0 0 100 6 2 18 -602 7 Charge I 7 8 Multiplicity I 1 9 Number of electrons I 530 10 Number of alpha electrons I 265 11 Number of beta electrons I 26512 Number of basis functions I 2015 13 Number of independent functions I 200514 Number of point charges in /Mol/ I 0 15 Number of translation vectors I 0

1 alpha 2 FOpt RB3PW91 Gen 3 Number of atoms I 101 4 Info1-9 I N= 9 5 89 86 0 0 0 100 6 2 18 -602 7 Charge I 7 8 Multiplicity I 1 9 Number of electrons I 530 10 Number of alpha electrons I 265 11 Number of beta electrons I 265And that's it.12 Number of basis functions I 2005 13 Number of independent functions I 200514 Number of point charges in /Mol/ I 0 15 Number of translation vectors I 0