Logs stop displaying

I am trialling EventLog Analyser
I have tried version 8 and 9 on both win 8 64 bit and windows server 2012.
I am running these as virtual servers with 6GB of mem on virtual box.

In every case after just working fine and collecting logs for a minutes its stops displaying logs.
I have a source that is constantly sending a few alerts every minute.
These are fresh VMs with no other programs running on them other than what comes with the OS.
Restarting the collector doesn't fix this

Any idea why this is happening?
Is it a virtual box thing?

This is very frustrating as I can see the potential for this product but I just cant get it to run for more than a few minutes.

Regards

Steven