When launching an XT3 application, the TotalView message:

Unable to open Debug Proxy Library.

is an indication that TotalView was unable to locate the library
libQKdb.so

Under Linux the file /etc/ld.so.conf contains paths to be
searched when resolving dynamic library locations. The
system administrator should verify that a proper path exists
for libQKdb.so. The standard location for libQKdb.so is
/opt/xt-catamount/default/lib/snos64/.