Executing a command using back-quotes appears to hang

I have posted this to the apache users mailing list due to the evidence to date, but since I also found some reference on the web to some, admitedly old, bugs regarding unclosed input pipes which seems to cause a similar hang I thought I'd also post here and see if anyone has any ideas as to where the problem might lie. ie with apache, with /bin/sh etc etc
We have several webservers currently running on apache httpd v2.2.3. They are started and stopped by a wrapper script which at some point simply calls "apachectl stop" or "apachectl start" to control the webserver. This is all working fine, we have had no issues with it.
I am currently trying to upgrade to v2.2.6 but have run into a problem. In the wrapper script, apachectl is called in back quotes. For example we would call it as follows in order to check the output for errors:
STARTUP=`<path>/apachectl start 2>&1`
When we use this construct to start httpd v2.2.3 it works fine. When we use it to start httpd v2.2.6 the command simply hangs there without exiting. I have tried doing this directly on the command line (as opposed to within a script) and get exactly the same.
However, the webserver process has started. I can access the webserver and if I run "apachectl stop" from another terminal, a few seconds later the hung command returns to the command prompt (or the script continues if called within the wrapper script).
I am running this on a Sun sparc V480 with solaris 9 installed (kernel patch 117171-05). Apache httpd is compiled with Sun Studio 8 (I have tried Studio 11 as well and get the same results).
Configure line was:
./configure prefix=<path to install> enable-so --enable-mods-shared=all \
enable-module=so with-mpm=worker --enable-nonportable-atomics=yes \
enable-proxy=shared enable-proxy-http=shared --enable-ssl=shared \
enable-cache=shared enable-file-cache=shared \
enable-disk-cache=shared enable-mem-cache=shared
I realise that this may not actually be a problem with apache itself, in fact it seems unlikely, but the only lead I have to go on at the moment is that, on my system, it doesn't happen with v2.2.3 and does with v2.2.6 and after comming up with a total blank on the search engines I am posting here in the hope someone has encountered something similar.
Regards,
Sean

Darren,
I ran a truss on the parent process while runinng the two commands as you suggested, the following was the basic difference with all leading and trailing output removed. I must admit to not being particularly adept are reading truss ouput.
When running "apachectl start"
time()                                          = 1194348702
lwp_sigmask(SIG_SETMASK, 0x00020002, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
fork1()                                         = 8525
lwp_sigmask(SIG_SETMASK, 0x00020002, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
setpgid(8525, 8525)                             = 0
lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
lwp_sigmask(SIG_SETMASK, 0x00020000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
lwp_sigmask(SIG_SETMASK, 0x06820000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
ioctl(255, TIOCGSID, 0xFFBFF654)                = 0
getsid(0)                                       = 16141When running "A=`apachectl start`"
time()                                          = 1194349187
pipe()                                          = 4 [5]
lwp_sigmask(SIG_SETMASK, 0x00020000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
lwp_sigmask(SIG_SETMASK, 0x00020002, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
fork1()                                         = 9122
lwp_sigmask(SIG_SETMASK, 0x00020002, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
setpgid(9122, 16147)                            = 0
lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
sigaction(SIGCLD, 0xFFBFF278, 0xFFBFF318)       = 0
close(5)                                        = 0
    Received signal #18, SIGCLD, in read() [caught]
      siginfo: SIGCLD CLD_EXITED pid=9122 status=0x0000
read(4, 0xFFBFF3D8, 128)                        Err#4 EINTR
lwp_sigmask(SIG_SETMASK, 0x00020000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
waitid(P_ALL, 0, 0xFFBFECB0, WEXITED|WTRAPPED|WSTOPPED|WCONTINUED|WNOHANG) = 0
waitid(P_ALL, 0, 0xFFBFECB0, WEXITED|WTRAPPED|WSTOPPED|WCONTINUED|WNOHANG) Err#1
0 ECHILD
setcontext(0xFFBFED20)
read(4, 0xFFBFF3D8, 128)        (sleeping...)
    **** HERE is where the truss output hangs untill I run "apachectl stop" in another terminal ***
read(4, 0xFFBFF3D8, 128)                        = 0
close(4)                                        = 0
lwp_sigmask(SIG_SETMASK, 0x00020000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
lwp_sigmask(SIG_SETMASK, 0x06820000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
ioctl(255, TIOCGSID, 0xFFBFF1E4)                = 0
getsid(0)                                       = 16141Sean

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