Some Gotchas

Here are few things I've encountered recently that I had to spend some time figuring out. 

In-App Purchases: 

• I created a test value for my in-app purchase id, no-ads-test, and then I purchased it. So far so good. But when I created the real in-app id and deactivated the test id, my app received an error saying that it could not find prices for a purchased product. So I activated the test id again, and all was well. The result is that in the Google Play Developer console I have a bunch of active test ids that are only active so I can buy new in-app products in the production version. It's just irritating not being able to clean it up. 
• When I created an alpha or beta version of Gemini Falcon, I added several people including myself to the Google Play Console / Settings / Gmail accounts with testing access. Again, so far so good. My testers could purchase in-app products without actually being charged for them. But when I created a production version of the app, the testers still could not buy in-app products. I had to remove their email addresses out of the Google Play Console / Settings / Gmail accounts with testing access area. ​

Not Power of Two

• When I was creating and modifying Gemini Falcon's artwork I reduced the size of some files and added to others, but I didn't keep them a power of two (512x512, 512x1024, etc). This worked fine on my Samsung phone, but it didn't work at all on my friend's Nexus phones. 

This is what it looked like on a Nexus phone ------>