UNIX Shell Script - Maxl - executing 4 Maxl script at the same time

Hi,
I wrote a UNIX shell script that basically call 4 maxl script to execute at once. But it seem to executing 2 maxl and then it goes to the last script. So, script 4a,4b,4c, & 4d should execute all at the same time. But for some reason at random only two script is being executed. And then it would go to script 5. Anybody have any answer to why it's doing this? Or is it something i'm doing it is incorrect help please?
I'm running essbase 11.1.2
Here is my script:
#!/bin/sh
# Maxl script to run
export MAXL_SCRIPT_1=/hyperion/..../script1.maxl
export MAXL_SCRIPT_2=/hyperion/..../script2.maxl
export MAXL_SCRIPT_3=/hyperion/..../script3.maxl
export MAXL_SCRIPT_4a=/hyperion/..../script4a.maxl
export MAXL_SCRIPT_4b=/hyperion/..../script4b.maxl
export MAXL_SCRIPT_4c=/hyperion/..../script4c.maxl
export MAXL_SCRIPT_4d=/hyperion/..../script4d.maxl
export MAXL_SCRIPT_5=/hyperion/..../script5.maxl
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_1 "
wait
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_2 "
wait
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_3 "
wait
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_4a " &
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_4b " &
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_4c " &
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_4d " &
wait
/usr/bin/sh -c "cd /hyperion/...../bin/; ./startMaxl.sh $MAXL_SCRIPT_5 "
echo Done.
Thanks,
Mark

Thanks!
I just noticed that the problem was due to something *within my application*.
I explain:
i built an application and I want it to be activated by my script.
I have another script running, but this is not a problem as I discovered later...
The problem is indeed that my script activates my application, but even when my application is opened, so it succeded, it stays hanged.
I found that the same thing does not happen with regulare applications, such as Safari or iTunes, so i narrowed down the probglem to my application...
Is there something i should do to it?
I checked the "scriptable" checkbox inside my application plist, but the result is still the same...

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