I have 188.8.131.5241 and have the same problem with trueglass. Initially none of the default aircraft had window droplets and I realized that when upgrading P3D I was installing just the client and not the content. Installing the content fixed the default aircraft. However the 717 still does not show any of the effects even though I can see it is installed in the gauges directory and have the enable and disable in the addons menu.
Not sure if there are any specific P3D settings that need to be enabled. I have the windshield and detailed precipitation enabled.
I couldn't find any setup information and have been monitoring this forum for a couple of weeks so sorry if there is any obvious fix.