I have a couple of those old-stock aftermarket shells from a Venezuelan seller on eBay. Both of them have this issue:
Bigger image
Maybe there is a tweaked design that sits more securely?
I've done 8-or-so PS1Digital installs now and several dozen DCDigital + WiiDual installs (and plenty more to come).
The most recent PS1Digital install seems to have a bad PS1Digital board. The colors on the screen are pale and washed-out. The strange color issue follows his PS1Digital board...