I admit I'm going a bit out on a limb on the updating every time thing, but in my experience when dealing with the filtering options, game lists, etc., in the MAME config, the update step; or lack of, has appeared to me to have a pretty significant impact. Perhaps this has changed in recent releases, or I'm completely wrong (not an unusual occurrence), but if for instance you go in and remove "Japan" from the filter options and don't update, then how is GameEx aware of the change without a database update?
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I hear ya about the remote assistance thing, and it does represent a certain level of trust. You allow a specific individual access for the allotted time to check out your setup. While helping out on testing I allowed Tom, so yeah, I wasn't the least bit worried, but I can see where there would be cause for concern for some, especially when you're new to our community. It does remove the social side of things here, and satisfaction of learning on your own. Honestly I think it's a great tool that has mostly flown under the radar. I've used it to control my GameEx rig from my workstation, and that alone makes it a fantastic plus to me!