DebugPrintf has 259 character limit?

Do I have a strange installation of CVI 2012 or is there a 259 character limit to an output string with DebugPrintf? I thought that my code was not working because my incoming data seemed to be truncated and I was monitoring it using DebugPrintf. I finally tried the following code on its own

char     string[] = {"insert 260 ascii characters"};

DebugPrintf ("%s",string);

When I run this only 259 of the characters are shown in the debug window.

If I change DebugPrintf to printf and check the 'copy standard I/O to debug window' in the environment setup then I get all the characters.

Just wondering.

Andy