I was trying to convert an existing virtual machine onto another ESXi ( HP Customized Image ESXi 5.0.0 version 5.30.28 based on ESXi 5.0.0 Vmkernel Release Build 799733 ) with VMware vCenter Converter Standalone Client Version 5.0.0 Build-470252

Upon select the destintation with the correct credentials the converter would just close and exit without error.

However upon choose the following ESXi box : (HP Customized Image ESXi 5.0.0 version 5.20.43 based on ESXi 5.0.0 Vmkernel Release Build 623860 ) , the converter would go through the next part of the wizard.

I upgraded to Version 5.0.1 build-875114 of the converter and this fixed the issue !