[Buildroot] App won't run on target machine

[JNY <jny0@hotmail.com>]

Hi,
I have an embedded linux system which is loaded from a bootable USB.
The kernel was built using Buildroot.  When configuring Buildroot, an
app is built at the same time.  When this app is run, it works fine.
I've recently noticed a few bugs in the app, and have therefore
recompiled the code (with said bugs rectified), but now the app won't
run.  As an experiment I wrote another app called test which would
print text to the screen, and this won't run either.  Is it necessary
for me to rebuild from Buildroot every time I want to fix a bug?  I
would have thought that as long as the recompilation is done on a
Linux system, it should work on another.  Both apps are written in c,
and the test app only uses stdio.h.
Regards, 
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