Ok I figured this out. After looking into the Clarktech 5000 posts (which apparently is quite similar to the 4900), it looks like I was missing the Module_002p.stb file. This file is no longer included in the latest firmware releases, so I dug it up from older firmwares.
Hope this helps others and prevents major head-scratching...
Mustafa, if you're reading this, the file is missing from later firmwares. BTW, should firmware and module_002p match??