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It's actually when the app is just flat-out installed, which is VERY odd; there's been some speculation that LG installed a failsafe to throttle the internal memory usage when too many apps are installed that affects the auto-push for Gmail syncing.

Like I said though, XLL was the last app I uninstalled before the syncing started functioning properly again so there has to be something else going on...
Being a person with a visual impairment, to such a degree that seeing the current 'light text on black background' color scheme is how I have to actually set all my electronics (when at all possible), I'd hope there are plans for users to be able to choose the skin design