UPDATE - 7/14/14 - THIS HAS BEEN RESOLVED WITH THE R7 UPDATE WHICH HAS BEEN APPLIED ACROSS OUR SYSTEM
Intuit recently rolled out maintenance release 6 for Quickbooks 2014 to fix various bugs, however there is a new bug that was introduced in this release that is causing the section headers in some reports to be truncated to one or two letters.
Intuit suggests a temporary workaround of exporting to Excel and then printing. Information on the problem and the workaround can be found on Intuit's site here:
We have been in contact with Intuit on the problem and they expect another update to be pushed out by the end of the week to address this problem. In the meantime if the workaround does not work for you or if you have any other problems please submit a support request.