We've just posted a public beta of SkyDemon 3.5 on our Android page, which includes rainfall imagery. Please give it a try and let us know here how you get on.
http://www.skydemon.aero/start/beta.aspx

The pink overlay appears for tiles that haven't been downloaded. That isn't a bug; tiles are only downloaded near your route, or where you've done a Get Weather for an airfield. You can also do a Get Weather for Chart if you want to see an entire country's rainfall. Our rainfall coverage is so wide that we don't want to download it all automatically; that would cause bandwidth and memory problems on some devices.

We only have rainfall forecasts available one hour into the future. Therefore it would never be possible to be looking at a rainfall forecast more than an hour old. One of the things I changed in today's beta, though, was to change the text so you CAN see when the forecast was issued. So we're looking for feedback on that as well as the other minor UI changes I mentioned above.

Hi Tim
Feedback on latest version....
When I first fire up the app and open the weather tab the date/time slider appears to be defaulting to 1015 on Saturday 26th not now.
Your explanation about the pink makes sense, seems to be when i've selected a time outside the data validity.
I cannot find anymore the text stating whether it is a forecast or actual, nor the new text showing update time that you reference.