I pulled down a trial V15.0 version and installed. I tried a "diff with latest version", after 2 -3 minutes I got a pop-up asking for my svn credentials and after 10 minutes I'm still waiting for something to happen.
strace of vs pid
waitpid(14586, 0xff8b6e8c, WNOHANG) = 0
gettimeofday({1285272523, 427593}, {240, 0}) = 0
nanosleep({0, 10000000}, NULL) = 0
select(17, [16], NULL, [16], {0, 0}) = 0 (Timeout)
select(21, [20], NULL, [20], {0, 0}) = 0 (Timeout)
waitpid(14586, 0xff8b6e8c, WNOHANG) = 0
gettimeofday({1285272523, 438800}, {240, 0}) = 0
nanosleep({0, 10000000}, NULL) = 0
select(17, [16], NULL, [16], {0, 0}) = 0 (Timeout)
select(21, [20], NULL, [20], {0, 0}) = 0 (Timeout)
waitpid(14586, 0xff8b6e8c, WNOHANG) = 0
gettimeofday({1285272523, 449034}, {240, 0}) = 0
nanosleep({0, 10000000}, NULL) = 0
select(17, [16], NULL, [16], {0, 0}) = 0 (Timeout)
select(21, [20], NULL, [20], {0, 0}) = 0 (Timeout)
waitpid(14586, 0xff8b6e8c, WNOHANG) = 0
gettimeofday({1285272523, 459337}, {240, 0}) = 0