I haven't tried the splash option on AppGameKit but just check in case its something to do with this:
I had 4 sound effects loaded into my app as wav files and only one worked, this baffled me for ages until I realised the extension of the file was in another case which windows doesn't show, it wasn't until I looked at the files in Linux that I realised the problem and when I changed them all to lower case it worked as I was loading them as lower case files, eg:
sound1.wav
sound2.WAV
sound3.WAV
Worth a look just in case.
Programming - AMOS on the AMIGA! / DBPro / Python / A bit of C C++ / now also AGK2! - Graphics - Deluxe Paint on the Amiga / Paintshop Pro / Photoshop / Lightroom / Grafx2
Previously worked for Prisma Software producing childrens educational software on the Amiga - Titles - Pepe's Garden - Paint Pot / Kids Academy range - Paint Pot II / Shopping Basket / Which Where What? / Blobs / Alvin's Puzzles